Slashdot Mirror


How Terahertz Waves Tear Apart DNA

KentuckyFC writes "Great things are expected of terahertz waves, the radiation in the electromagnetic spectrum between microwaves and the infrared. Terahertz waves pass through non-conducting materials such as clothes, paper, wood and brick and so cameras sensitive to them can peer inside envelopes, into living rooms and 'frisk' people at distance. That's not to mention the great potential they have in medical imaging. Because terahertz photons are not energetic enough to break chemical bonds or ionize electrons, it's easy to dismiss fears over their health effects. And yet the evidence is mixed: some studies have reported significant genetic damage while others, although similar, have reported none. Now a team led by Los Alamos National Labs thinks it knows why. They say that although the forces that terahertz waves exert on double-stranded DNA are tiny, in certain circumstances resonant effects can unzip the DNA strands, tearing them apart. This creates bubbles in the strands that can significantly interfere with processes such as gene expression and DNA replication. With terahertz scanners already appearing in airports and hospitals, the question that now urgently needs answering is what level of exposure is safe."

279 comments

  1. Who cares... by Anonymous Coward · · Score: 5, Funny

    Who cares if we turn into an entire country of genetically deformed freaks, at least we'll be a country of SAFE and FREE genetically deformed freaks, right? Just as envisioned by our Founding Fathers. God Bless America.

    1. Re:Who cares... by Xest · · Score: 3, Interesting

      Yeah exactly, so what if I have to have my arm amputated because of an agressive cancer caused by these scanners, at least it means I wont have to lose my arm to a terrorist!

    2. Re:Who cares... by postbigbang · · Score: 1

      Already, a friend of mine that's a cell phone addict (and has been since they were 'perfected') has had numerous benign growths removed from her face.

      EMI apparently has, at various freqs, the ability to rattle our anatomy. To what extent-- we need to know, and know soon.

      When I go through the airport scanners and get stripped by UUHF waves, I wonder just what's getting blown around inside me. Maybe low and vhf weren't as nasty. Maybe they were. The problem is: we don't know and we oughta find out in finality.

      --
      ---- Teach Peace. It's Cheaper Than War.
    3. Re:Who cares... by Anonymous Coward · · Score: 1, Insightful

      Already, a friend of mine that's a cell phone addict (and has been since they were 'perfected') has had numerous benign growths removed from her face.

      [citation needed].

      You need to understand the difference between ionizing radiation and non-ionizing radiation. Don't try to draw a correlation between benign growths and cellphone use. Your local AM radio station, an old microwave that isn't properly insulated, your television with rabbit ears, your cordless phone, your 802.11x access point in your house, and many others are also hitting you with non-ionizing radiation.

    4. Re:Who cares... by postbigbang · · Score: 3, Interesting

      We agree. I'm not trying to go all tin-foil hat, but there are gigawatts in major cities floating around, nudging things in your body. You tell me which ones are ok [add your own citations, and I'll add mine] and everything will be fine. They'll stop the ones that have a higher statistical possibility of blowing apart DNA, RNA, or otherwise wreaking havoc, right? And everyone will follow the rule, right?

      My citation is admittedly anecdotal. But her surgeries weren't. They were damn painful.

      --
      ---- Teach Peace. It's Cheaper Than War.
    5. Re:Who cares... by timias1 · · Score: 1

      Well it is a win-win situation for the airlines since they will be able to charge you a baggage fee for your new prosthetic arm. They could also remove one of your arm rests to save weight since you won't need it.

    6. Re:Who cares... by Anonymous Coward · · Score: 0

      This is something I would more expect of Britain, Germany, Spain, or any of the other "progressive" states rather than the US.

    7. Re:Who cares... by Mister+Whirly · · Score: 5, Funny

      I know what you mean. I had a friend who talked on the cell phone all the time, and then 7 years later - BAM - herpes.

      --
      "But this one goes to 11!"
    8. Re:Who cares... by Anonymous Coward · · Score: 0

      "People willing to trade their freedom for temporary security deserve neither and will lose both." - Benjamin Franklin

    9. Re:Who cares... by Xest · · Score: 1

      Tell me about it, it's nasty stuff. I carry my cell phone in my pocket all day every day and sometimes I get this growth between my legs.

    10. Re:Who cares... by kpainter · · Score: 1

      ...turn into an entire country of genetically deformed freaks...

      Sounds like this could be weaponized. Such a weapon could give the phrase "Tear you a new asshole" a sense of literalism.

    11. Re:Who cares... by Kronik+Gamer · · Score: 2, Insightful

      Awesome, now I can watch someone try to organize a class action lawsuit against Apple because they claim that the iPhone gave them herpes.

      *grabs popcorn*

    12. Re:Who cares... by Jah-Wren+Ryel · · Score: 2, Informative

      My citation is admittedly anecdotal. But her surgeries weren't. They were damn painful.

      Anecdotal, yet really painful. Well, that clinches it!
      Just like that guy accused of being a child rapist and murderer, it was a horrible fate for the kid, therefore that slimeball is guilty as sin.

      --
      When information is power, privacy is freedom.
    13. Re:Who cares... by dgatwood · · Score: 1

      Either start answering your phone or quit setting it to vibrate.

      --

      Check out my sci-fi/humor trilogy at PatriotsBooks.

    14. Re:Who cares... by Anonymous Coward · · Score: 0

      The problem is the "gigagwatts" in a city are not focused on your body in a 2x6 box. Focus has a MAJOR thing to do with it. A laser spread across the state of texas does NOTHING but one thats as fine as a pin will put a hole in your heart at 500 meters. Go figure eh? Science really does work.

      -5 for lack of research

    15. Re:Who cares... by Korin43 · · Score: 1

      Gigawatts? In my air!?

    16. Re:Who cares... by postbigbang · · Score: 2, Insightful

      And so you drive by several antenna towers, each pumping out several megawatts at freqs ranging from the 540khz range through FM around 100mhz to TV starting under 100mhz to say 600mhz+. You add in cells starting in at 450mhz and various VHF/UHF transmitters-- yes, at a lower power.

      But as you travel by the non-microwave towers, and their 20-30megawatts comes into close proximity to you, you might recall the days of St Elmo's fire, when there was enough EMF being broadcast to make fences literally glow and dance with little electrons.

      Now, you carry a cell/mobile on your body, somewhere. In your ear might be a microwatt bluetooth device at 2.4ghz, and your laptop is using similar or 5ghz spectra at several milliwatts.

      The aggregate amount of EMF exposure is pretty high compared to say, 1900 when there was effectively on the amount generated by lightning. Are DNA immune to electrons and various state charges? If so, at what freqs and with what kinds of modulation?

      Lack of research! Yes-- now you get the point.

      --
      ---- Teach Peace. It's Cheaper Than War.
    17. Re:Who cares... by shentino · · Score: 1

      Strange, I thought cellphones gave you hearing aids.

    18. Re:Who cares... by sjames · · Score: 2, Interesting

      While the case for cellphone damage is looking fairly weak, EM being non-ionizing isn't why.

      Yes, ionizing radiation has a lot more potential to cause damage, but non-ionizing radiation can also cause damage. Were that not the case, microwave ovens would do nothing.

      Different wavelengths have different potential to cause harm. In this case, the idea is that terahertz waves may be able to do more damage than shorter wavelength infrared as well as doing more than the same powered microwaves and certainly more than medium wave AM. Even in the latter case, there are well recognized exposure limits that must be considered when doing an antenna site survey or performing maintenance.

      The problem with the terahertz scanners is multiple. First and foremost, they got approved as 'obviously' safe with no evidence to back that up at all. Next, unlike incidental exposures, the scanners deliberately irradiate human beings in the performance of their primary function. Unlike my rabbit ears or my wifi, we have very little accumulated data on human exposure to THz waves. We didn't REALLY have enough on cellphones either, but have since done the studies and gotten a fortunate answer.

    19. Re:Who cares... by Anonymous Coward · · Score: 0

      You heard it on slashdot first folks, cellphones give you AIDS.

    20. Re:Who cares... by Mutso · · Score: 1

      Who cares if we turn into an entire country of genetically deformed freaks, at least we'll be a country of SAFE and FREE genetically deformed freaks, right? Just as envisioned by our Founding Fathers. God Bless America.

      We are all inbred to the point of insanity anyway....perhaps this is how we all turn into brain eating zombies.

    21. Re:Who cares... by RockDoctor · · Score: 1

      Anecdotal, yet really painful. Well, that clinches it!
      Just like that guy accused of being a child rapist and murderer, it was a horrible fate for the kid, therefore that slimeball is guilty as sin.

      What does it matter whether or not he was innocent and had a cast-iron alibi. He's dead now and swinging from the tree outside the courthouse, so all is good in the world.

      --
      Birds are not dinosaur descendants;birds are dinosaurs, for all useful meanings of "birds", "are" and "dinosaurs"
  2. Shoe-Fitting Flouroscope by eldavojohn · · Score: 5, Interesting
    Reminds me of the time I was at the Science Museum in Minnesota and they had an exhibit from the Museum of Bad Science (or something like that). Anyway they had a shoe-fitting flouroscope which was a device that shoe stores bought. Basically you would put shoes on your child's feet but to see how well they fit you would jam their leg in this thing and see the bones of the toes up to the tip of the shoe and see how well it fit. See the problem yet?

    Although store clerks were frequently exposed to the radiation from the machines, the radiation was more dangerous to children who placed their feet directly into the radiation. The exposure rate is thought to have been approximately 0.005 Gy to 0.058 Gy per second. If children tried on several pairs of shoes per visit it was posited that they could be exposed to as much as 0.1 Gy to 1.16 Gy. In fact, experiments indicated that radiation could exceed 1 microGy per hour as far as 10 feet away from the machine.

    This device should be a warning (and I think it has been if you look at how cautious people are of new technologies like cell phones). Hopefully my sperm aren't being fried when I walk through a scanner in an airport--at least the parents of the 30s were using X-rays for their convenience and not the invasion of their privacy!

    --
    My work here is dung.
    1. Re:Shoe-Fitting Flouroscope by Anonymous Coward · · Score: 0

      If "rays" were going to do that it's already been done. O_o

    2. Re:Shoe-Fitting Flouroscope by Anonymous Coward · · Score: 0

      Except this is an example of us already learning from the past.
      The body scanners in use now are passive. You got it they use the natural background radiation to scan so they do not irradiate at all. New scanners that are now in testing are starting to use emitters. They are in testing and some testing have shown that under rare instances that this radiation could be damaging.
      So the scientists didn't ignore the issue but tracked it down and found the cause before they active scanners went in to service.
      In other words we have learned from the past and in this case the system has worked very well.

    3. Re:Shoe-Fitting Flouroscope by Anonymous Coward · · Score: 0

      to me that new discovery should be used to find a way to repair genes, or even fight cancer.

      many times some discovery in one field leads to a major advance in another ...

    4. Re:Shoe-Fitting Flouroscope by Sockatume · · Score: 1

      It wasn't any better than just measuring the kid's feet, to boot. Shoe-curity theatre.

      --
      No kidding!!! What do you say at this point?
    5. Re:Shoe-Fitting Flouroscope by Anonymous Coward · · Score: 1

      If some of your Little Johns get a bit frazzled, you could theroetically make more so long as the rest of you stays intact. A woman, however, never makes more eggs. If those get fried, that's the end of the line.

    6. Re:Shoe-Fitting Flouroscope by Mikkeles · · Score: 1

      They were common through the '50s anyway; I remember them in the shoe stores and, boy, were they cool!

      --
      Great minds think alike; fools seldom differ.
    7. Re:Shoe-Fitting Flouroscope by Anonymous Coward · · Score: 0

      Who cares if your sperm are fried? You're making like a trillion of them a day...unless ur a grrl...in which case you're probably not making any.

    8. Re:Shoe-Fitting Flouroscope by nitehawk214 · · Score: 3, Interesting

      This is exactly what I thought of when I read the summary. In fact I just saw the episode of Modern Marvels: Engineering Disasters that covers this topic last night.

      My favorite: the Revigator!

      --
      I'm a good cook. I'm a fantastic eater. - Steven Brust
    9. Re:Shoe-Fitting Flouroscope by gad_zuki! · · Score: 2, Insightful

      >Hopefully my sperm aren't being fried when I walk through a scanner in an airport--at least the parents of the 30s were using X-rays for their convenience and not the invasion of their privacy!

      Airports use metal detectors for humans, not xrays. The new millimeter wave machines arent xrays. As far as safety, have is been demonstrated that these machines damage organisms in regular usage? It seems to me that a lot of this is reactionary nonsense like "I'm allergic to wifi!!" nonsense.I am concered about safety, but jumping on the naturalist/homeopathy/conspiracy theory bandwagon doesnt do us any good.

      Not to mention just flying on a plane gives you a nice dose of cosmic rays, sans superpowers.

      >not the invasion of their privacy!

      Yes, lets give up on airport security. That will end well.

    10. Re:Shoe-Fitting Flouroscope by Mister+Whirly · · Score: 1

      Reminds me of the time I was at the Science Museum in Minnesota and they had an exhibit from the Museum of Bad Science (or something like that).

      It is the Museum of Questionable Medical Devices. (It used to be housed in St. Anthony Main, but when that clsoed they moved it to the Science Museum.)

      --
      "But this one goes to 11!"
    11. Re:Shoe-Fitting Flouroscope by pilgrim23 · · Score: 1

      I know that I am not fashionably new but: can you convert that to roentgens so it agrees with my Civil Defense doseometer? Apples and Oranges seem to be all the rage in comparisons these days

      --
      - Minutus cantorum, minutus balorum, minutus carborata descendum pantorum.
    12. Re:Shoe-Fitting Flouroscope by Sockatume · · Score: 2, Funny

      have is been demonstrated that these machines damage organisms in regular usage

      Actually, that's what the article opens with: there are conflicting experimental reports (none involving extra heads or hair falling out, mind you) it seeks to clarify. Worth reading IMO.

      --
      No kidding!!! What do you say at this point?
    13. Re:Shoe-Fitting Flouroscope by gad_zuki! · · Score: 1

      The article has some serious flaws. It claims that these machines are in use. I dont think the author understands that millimeter wave machines are passive. They are not active. So all the concerns about radiation are unfounded scaremongering. Again, Im asking for studies that show these machines that are in use are dangerous.

    14. Re:Shoe-Fitting Flouroscope by Sockatume · · Score: 2, Funny

      I meant the actual research article.

      --
      No kidding!!! What do you say at this point?
    15. Re:Shoe-Fitting Flouroscope by Eivind+Eklund · · Score: 1

      >not the invasion of their privacy!

      Yes, lets give up on airport security. That will end well.

      What in particular makes you think that these things increase security? The penetration testing reports I've seen (18 out of 20 guns pass through) doesn't really seem to indicate much help. Security theater.

      --
      Doubting the existence of evolution is like doubting the existence of China: It just shows that you're uninformed.
    16. Re:Shoe-Fitting Flouroscope by Anonymous Coward · · Score: 0

      Those x-ray shoe fit machines were still around in the late 40's or early 50's in Canada. I remember watching my toe bones move in the shoes. Much more interesting than how well the shoes fit. The machines were a sales scam (as someone mentioned here the same thing can be done with foot measurements) but none of us knew any better than to allow ourselves to be exposed. We were just kids with unknowing adult parents.

      Although on a good note, I've been pretty healthy except for bad knees and I had two healthy sons. Guess my Mom must have got tied of it and got me out of there before I overdosed. I think I would have watched those foot bones a bit longer if she hadn't been in a hurry.

    17. Re:Shoe-Fitting Flouroscope by codegen · · Score: 2, Insightful

      I know this is slashdot, but did you read anything before replying? The article in discussion (at the top of the page fyi) discusses the discovery that millimeter wave radio waves appear to be resonant with DNA, resulting in significant DNA damage. Yes the new millimeter wave machines are not Xrays. But this is new research that shows that the effects may be greater than anticipated. It certainly bears looking into to determine if there is a problem.

      The parent poster was drawing a similarity in the use to that of the use of XRays for fitting shoes. He certainly wasn't talking about giving up on airport security. The metal detectors work quite well. I haven't seen much evidence that spending a lot of money to allow some barney fife to look at my privates is going to significantly increase the security of flying. And to those who modded you insightful, get a clue!

      --
      Atlas stands on the earth and carries the celestial sphere on his shoulders.
    18. Re:Shoe-Fitting Flouroscope by gad_zuki! · · Score: 1

      The millimeter wave machines in US airports are passive, not active. So this is all interesting but academic.

    19. Re:Shoe-Fitting Flouroscope by painandgreed · · Score: 2, Informative

      The exposure rate is thought to have been approximately 0.005 Gy to 0.058 Gy per second. If children tried on several pairs of shoes per visit it was posited that they could be exposed to as much as 0.1 Gy to 1.16 Gy. In fact, experiments indicated that radiation could exceed 1 microGy per hour as far as 10 feet away from the machine.

      To put this into context, the Gy (gray), is the amount of absorbed radiation. One gray is typically the point where physical effects are felt, usually in a burn to the skin. 5 Gy over the entire body is considered a lethal dose.

    20. Re:Shoe-Fitting Flouroscope by hazem · · Score: 1

      The millimeter wave machines in US airports are passive, not active. So this is all interesting but academic.

      You're only partially correct. The article you linked above clearly contrasted the hand-held millimeter devices by pointing out they are passive. However, the large walk-through devices already in use in several airports actively emit millimeter radiation. So it's not merely an academic point.

    21. Re:Shoe-Fitting Flouroscope by sjames · · Score: 1

      The more important question where human health and safety is concerned is has it been demonstrated that THz scanners do NOT harm people?

      Arguments about different exposures to different classes of EM radiation are like saying blueberries have never harmed me so these belladonna berries must be perfectly safe!

      We've had air travel for more than half a century now without THz scanners and it has proven very safe. There's a wide gulf between not using THz scanners until we're sure they're both harmless and necessary and giving up on airport security.

    22. Re:Shoe-Fitting Flouroscope by Nivag064 · · Score: 1

      I fremember, as a child in England, deliberately going into a shoe shop to have a look at the bones in my feet.

      It appeared that no-one suspected any possible health problems with these devices.

  3. Remember citizen by Nursie · · Score: 4, Insightful

    continuity of the state and its power structures is far more important than petty things like individual freedoms or human lives.

    1. Re:Remember citizen by cerberusss · · Score: 2, Informative

      continuity of the state and its power structures is far more important than petty things like individual freedoms or human lives.

      Yep, and things like the Universal Declaration of Human Rights are only for people like us, not sub-human towelheads, Jews, Christians, Arabs, Catholics, Scots, Buddhists, dissidents or other noisemakers.

      --
      8 of 13 people found this answer helpful. Did you?
    2. Re:Remember citizen by dintech · · Score: 2, Insightful

      I'd rather unzip my trousers than than let this 'frisker' unzip my DNA. Who knows, a naked security line might actually make airports fun again.

    3. Re:Remember citizen by BlackSnake112 · · Score: 1

      Fun or many people screaming "My eyes! My eyes! I have been blinded!"

      Personally if this make that scanner wall from total recall a reality I would be for it. But only if they can prove that we are not harming out DNA in the process.

    4. Re:Remember citizen by bloobamator · · Score: 1

      Please tell me the parent was modded "insightful" because of its biting sarcasm.

      --
      "Crude and slow, clansman. Your attack was no better than that of a clumsy child."
    5. Re:Remember citizen by More_Cowbell · · Score: 3, Funny

      The parent was modded "insightful" because of its biting sarcasm.

      --
      Experience teaches only the teachable. -AH
    6. Re:Remember citizen by conspirator57 · · Score: 1

      I will now make a killing selling tin foil hats and body "armor" in airport kiosks just outside the security checkpoints. Thank God for TSA; how else would such a ludicrous business be feasible?

      --
      "If still these truths be held to be
      Self evident."
      -Edna St. Vincent Millay
    7. Re:Remember citizen by Douglas+Goodall · · Score: 1

      You can rent them on one side and collect them on the other...

  4. Ethical use of panic... by h4rm0ny · · Score: 4, Interesting


    So if there's a hysterical OMGCancer panic amongst the scientific illiterate, is it ethical to take advantage of that to protect ourselves against the privacy abuses of these things at train stations and airports and on the street?

    --

    Aide-toi, le Ciel t'aidera - Jeanne D'Arc.
    1. Re:Ethical use of panic... by oldspewey · · Score: 5, Informative

      Hasn't it always been the case that you have the option to decline to use "the machine" and be hand-searched instead?

      Until this issue gets resolved, that's what I plan to do anyhow.

      --
      If libertarians are so opposed to effective government, why don't they all move to Somalia?
    2. Re:Ethical use of panic... by Anonymous Coward · · Score: 0

      There is no such thing as an ethical use of panic.

      Pushing any idea without the full understanding of the people "for their own good" is the worst kind of tyranny.

    3. Re:Ethical use of panic... by Idiomatick · · Score: 3, Insightful

      If they had two lanes that'd be fine and dandy. But refusing to be searched and requesting to be done by hand is making yourself a suspect. As soon as you ask that enjoy being treated like you tried to sneak a gun on board.

    4. Re:Ethical use of panic... by Yvanhoe · · Score: 2, Insightful

      What is this ethics thing you are talking about and since when was it relevant to fight in a political arena ?

      --
      The Wise adapts himself to the world. The Fool adapts the world to himself. Therefore, all progress depends on the Fool.
    5. Re:Ethical use of panic... by AioKits · · Score: 4, Interesting

      With my assorted body jewelry I find it less hassle to actually be patted down. The scanners (last time I flew it was a millimeter waves scanner) always detect something 'on me'. The last time I went through they pulled me aside and asked, "Do you have anything on your chest sir?" I thought they were asking if I had something I wanted to tell them so I said no. They had to clarify, "Do you have any foreign objects on your chest?" I have one ring in that area, but it is only 12 gauge and not big enough to be mistken for anything really. So... I was escorted to a lil clear box, patted down, and sent on my way.

      I have little to no shame, so it didn't really bother me he was patting me down. In fact he seemed to grimace at the fact he had to do it, which made it all the more enjoyable to me.

      So now I just skip any of the scanners and opt for a pat down. It slows down security, it appears to make them uncomfortable, and if I'm lucky it'll be someone attractive patting me down.

      --
      "Quote me as saying I was mis-quoted." -Groucho Marx
    6. Re:Ethical use of panic... by Anonymous Coward · · Score: 0

      "the worst kind of tyranny"

      The kind that every "democratic" government is using as much as they can?

    7. Re:Ethical use of panic... by Anonymous Coward · · Score: 0

      Hasn't it always been the case that you have the option to decline to use "the machine" and be hand-searched instead?

      Until this issue gets resolved, that's what I plan to do anyhow.

      Yeah good luck if you're from middle eastern descent. I can tell you that people eyeball you enough as it is, now if I decline to use "the machine", how do you think the reactions would be? And please -- don't rationalize, people aren't rational.

    8. Re:Ethical use of panic... by lordholm · · Score: 1

      I passed through one of these at Schiphol, this was about 2 years ago when no one know what they where. It was there as an experimental deployment, but nowhere did it say that the machine would look through your clothes. For all I know, it looked like an advanced metal detector.

      Although, while there was one queue that went to a place where there was a normal metal detector and a guy frisking you, you had to pick a queue at the start, and then you usually picked the shorter queue.

      I was mighty pissed when I read about the machines and realised that they where literally peeking under your clothes.

      --
      "Civis Europaeus sum!"
    9. Re:Ethical use of panic... by BadAnalogyGuy · · Score: 0, Troll

      The concept of a clear box as some sort of booth for performing searches is so far removed from my concept of what America ought to be that I'm terribly saddened and honestly angered that this country has gone so far towards fascism and jack-booted thuggery in so little time. While you may not feel much shame, in general people would usually prefer to be taken to an area that maintains some semblance of privacy in the odd event that such a search is necessary. That we are searching people at all with this much effort is a travesty.

      As for getting an attractive person to pat you down, I can only say that I hope you are gay or bisexual because the guard who pats you down is required to be the same gender as you. Of course you already have piercings, so it may go without saying.

    10. Re:Ethical use of panic... by Anonymous Coward · · Score: 0

      There is a balance to that 'shame/privacy' by being patted down in a clear box though. It also means the officers patting you down don't have privacy and so they might be less likely to molest you in the process.

      To be fair it should be in a room with a camera that isn't viewable by other people but whatever.

    11. Re:Ethical use of panic... by oldspewey · · Score: 1

      "I have seen research that indicates these machines might not be safe, especially for frequent travellers. I am perfectly willing to undergo a manual search instead."

      Was that so hard?

      --
      If libertarians are so opposed to effective government, why don't they all move to Somalia?
    12. Re:Ethical use of panic... by Evil+Shabazz · · Score: 1

      Tell that to FOXNews, please.

      --
      Down with the career politician! SUPPORT TERM LIMITS
    13. Re:Ethical use of panic... by TheCarp · · Score: 1

      Of course, I agree with you. However, what if your opinion is that this is EXACTLY what the other side is doing. If it wasn't for fearmongers fanning the flames of irrational panic, we wouldn't have a TSA, "mm wave" scanners, or anything like that. In fact, airport security wouldn't have hardly changed at all since the mid 1980s.

      How do you fight that sort of tyranny, if its the "worst kind"?

      -Steve

      --
      "I opened my eyes, and everything went dark again"
    14. Re:Ethical use of panic... by domatic · · Score: 3, Funny


      So now I just skip any of the scanners and opt for a pat down. It slows down security, it appears to make them uncomfortable, and if I'm lucky it'll be someone attractive patting me down.

      http://www.metrolyrics.com/security-joan-lyrics-fagen-donald.html

      chuckle...snort!

    15. Re:Ethical use of panic... by Anonymous Coward · · Score: 0

      The concept of a clear box as some sort of booth for performing searches is so far removed from my concept of what America ought to be that I'm terribly saddened and honestly angered that this country has gone so far towards fascism and jack-booted thuggery in so little time.

      I'm an oldthinker. I unbellyfeel AmSoc too. But the box is clear so that your potential abuser doesn't have any privacy either.

      Seriously - you'd really prefer an opaque box, or for the ultimate in privacy, a soundproof and lightproof room, where a TSA goon's potential abuse would never be be witnessed by anybody except the fellow TSA goon operating the camera?

      Because those really are the only two options in post-9/11 America.

    16. Re:Ethical use of panic... by kilfarsnar · · Score: 1

      Yes, that kind. I'm gonna go ahead and agree with that. Though it might be expedient, I don't think it's ethical to take advantage of people's ignorance.

      I don't think it's a durable strategy anyway. The whole reason our rights are being taken away is that people are more concerned about safety than with their rights (and they're only worried about safety because they've been propagandized). So preserving their rights by taking advantage of a different ignorant panic doesn't solve the root problem. It's catching a fish for a man instead of teaching him to fish.

      --
      "What the American public doesn't know is what makes them the American public." -Ray Zalinsky (Tommy Boy)
    17. Re:Ethical use of panic... by Anonymous Coward · · Score: 0

      How about to antiracists and the proponents of "We Have 50 Days To Solve Climate Change"?

    18. Re:Ethical use of panic... by AioKits · · Score: 1

      That Sir is win. Thank you!

      --
      "Quote me as saying I was mis-quoted." -Groucho Marx
    19. Re:Ethical use of panic... by Anonymous Coward · · Score: 0

      And please -- don't rationalize, people aren't rational.

      Are you blind? I could be saying anything and no matter what I say all that circulates in the security officers (not to mention everybody elses) mind is: "he's not cooperative, he's hiding something." If you think I'm overreacting it's because you're putting your egocentric self in my scenario, except you're not of middle eastern descent. Get yourself a friend of middle eastern descent and join him once at the airport, follow him and just observe how more or less everybody is eyeballing him. Tell him to kindly decline using "the machine". Sit back -- and learn.

    20. Re:Ethical use of panic... by DinDaddy · · Score: 1

      Interesting site. Refuse the cookie it tries to place and the the lyrics disappear leaving the rest of the page intact.

    21. Re:Ethical use of panic... by oldspewey · · Score: 1

      I have travelled with team members of many different ethnicities, including middle eastern. I have not witnessed what you describe. Hell, one time I was even the one pulled aside for supplemental screening while my colleagues walked on unhindered, and my skin is milky white most months of the year.

      --
      If libertarians are so opposed to effective government, why don't they all move to Somalia?
    22. Re:Ethical use of panic... by J.Y.Kelly · · Score: 1

      We're sorry - "OMGCancer panic" (c) is copyrighted and owned by FOXNews

      I think the Daily Mail may have some prior art on that topic...

    23. Re:Ethical use of panic... by Evil+Shabazz · · Score: 1

      I'm sorry, I think you're referring to a reasonably logical copyright or patent system. Silly things like logic and common sense do not apply to US law. Prior art in US copyright only matters if you can't afford to get the enforcement agencies to look the other way. Rupert Murdoch does not fall into this category. ;)

      --
      Down with the career politician! SUPPORT TERM LIMITS
    24. Re:Ethical use of panic... by Anonymous Coward · · Score: 0

      I have not witnessed what you describe.

      I didn't say walk next to him and laugh and joke and prove to everybody that "he's ok, he's with a white person." Have him walk alone, with you following him. You're a very self centred person to not understand this very difference, but then again I don't expect you to because you have never experienced the scenario where everybody around you suspects and fears you for a crime you haven't even committed. This makes you of mere average intelligence.
       
      If I don't dress and look sharp I'm always pulled out for a "routine check". I can never dress casual and be unshaved, and fortunately even though I'm "born" muslim I repel the very thought of religion. By fortunately I mean that there are people with far more problems than I. It's just very convenient for a person who has never experienced and will never experience this to play it down and say, "no, that's just crazy talk."
       
      The difference between our views is that I'm basing my story on experience, you're basing your story on assumption. What further proves your average intelligence is that you think you're basing it on experience, as whatever doesn't happen around you doesn't happen at all, right? Wrong.

    25. Re:Ethical use of panic... by shrtcircuit · · Score: 1

      What I find interesting is that you assume *everyone* is thinking you are a terrorist. I certainly don't think that every time I see someone of middle eastern descent, the same as I don't assume every Mexican jumped the border and is here illegally, or every black person is dealing crack, or...

      I'm not trying to make light of your experiences, and I can only imagine the kinds of things you've certainly experienced. In a better world, maybe it wouldn't happen. But please don't just lump all of us into some expectation that we all think you're up to something. Fact is I know a fair amount of white folks that are into things a lot scarier than you probably are. Personally I look for *people* that are up to something, not based on any ethnic reasoning. Some of us are in point of fact capable of looking at people as people, instead of an ethnic box of crayons.

      I hope one day you have better experiences being who you are, where you are, I truly do. Society needs to evolve everywhere.

    26. Re:Ethical use of panic... by oldspewey · · Score: 1

      You're very quick to make assumptions about other people's level of experience, knowledge, and intelligence. I would suggest this dimension of your personality may be at least partly responsible for the undue attention you claim you receive.

      Allow me to further clarify my experience with airport screeners. I am an IT consultant working in a large consulting organization. Frequent air travel is a part of my life, as it is with all my colleagues. When I am on a client project, I will find myself working with anywhere between zero and ten of my colleagues. Sometimes I fly with the group, and sometimes I fly alone. When I happen to be flying with a "brown" person we may or may not look like we're "together" as we pass through security.

      But regardless of what I've personally witnessed in airports, one thing that happens is that our team talks. We go out for lunch or dinner and share all our stories about our families, the crappy selection at the rental car lot this week, things that happened at the airport, things that are going on inside our corporation, interesting trends in technology, or whatever. It's just a bunch of guys (well, usually it's guys though there are a handful of women in our consulting organization) shooting the shit, and if somebody has a complaint about something - anything - that happened while in transit it's going to get talked about.

      So in summary, I am sorry to hear that you seem to get singled out more than has been the experience of my varied colleagues ... but as I stated above, you might be amazed the difference a little attitude adjustment might make.

      --
      If libertarians are so opposed to effective government, why don't they all move to Somalia?
    27. Re:Ethical use of panic... by blueg3 · · Score: 2, Informative

      I'm not sure which airports you go to, but the ones I go to, about half the people searched opt not to use the scanner, and the TSA agents clearly don't give a damn which route you take.

    28. Re:Ethical use of panic... by noundi · · Score: 1

      What I find interesting is that you assume *everyone* is thinking you are a terrorist. I certainly don't think that every time I see someone of middle eastern descent, the same as I don't assume every Mexican jumped the border and is here illegally, or every black person is dealing crack, or...

      I'm not trying to make light of your experiences, and I can only imagine the kinds of things you've certainly experienced. In a better world, maybe it wouldn't happen. But please don't just lump all of us into some expectation that we all think you're up to something. Fact is I know a fair amount of white folks that are into things a lot scarier than you probably are. Personally I look for *people* that are up to something, not based on any ethnic reasoning. Some of us are in point of fact capable of looking at people as people, instead of an ethnic box of crayons.

      I hope one day you have better experiences being who you are, where you are, I truly do. Society needs to evolve everywhere.

      I understand your point, and even though I'm saying everyone, I'm referring to the large mass which finds itself at the lower scale of human intelligence -- that large mass which tends to be responsible for most of the bad things, influenced by humanity, which happens in this world. I think however you missed one point which I like to make clear, which I wrote and quoted once again further up.

      And please -- don't rationalize, people aren't rational.

      This time I'll explain it. What I mean is: don't try to look at this problem from a rational point of view, providing such simple answers as: "well obviously people aren't guilty of a crime which they haven't yet committed, thus you should have no problems!" This is already given, but people (by people I don't mean everyone, once again I'm referring to the lower scale of human intelligence, intelligent beings deserve no such generalisations) aren't rational, they are idiots driven by hormones, instantly manipulated with the snap of a finger.

      --
      I am the lawn!
    29. Re:Ethical use of panic... by Atraxen · · Score: 1

      I hit it with java/js disabled - it shows the first line and demand you turn it back on to see the rest... ...but you can select down past that in the frame that it's hiding and paste into Notepad. Immediately afterward, I realized that there was an ad to the right of it that was scrolling the same lyrics anyway. So, one obnoxious site managed to fix another one - guess two wrongs sometimes DO make a right!

      --
      Be careful of your thoughts; they could become words at any minute...
    30. Re:Ethical use of panic... by tabrnaker · · Score: 1

      It's apparent he doesn't go to any airports because he's too paranoid to leave his parent's basement.

    31. Re:Ethical use of panic... by tabrnaker · · Score: 1
      We criticize in others the things we do ourselves. Those who believe others are prejudiced towards them are actively prejudging others by that belief.

      It's the way the world works, even animals sense what we project outwards. Most times if you're afraid of an animal it will act in frightening ways, and if you are not afraid it will even ignore you, whether it be cats, dogs, or wild bears.

    32. Re:Ethical use of panic... by siriuskase · · Score: 1

      I have little to no shame, so it didn't really bother me he was patting me down. In fact he seemed to grimace at the fact he had to do it, which made it all the more enjoyable to me.
      So now I just skip any of the scanners and opt for a pat down. It slows down security, it appears to make them uncomfortable, and if I'm lucky it'll be someone attractive patting me down.

      This is an excellent post. Until this, I never could see the point in nipple jewelry. You get the pat down without having to look like a terrorist by asking for it. How well do you think it would work for females?

      --
      If you must moderate, please moderate as irrelevent, not something bad, because I'm sure someone will find this interest
    33. Re:Ethical use of panic... by AniVisual · · Score: 1

      Still, given the proximity of the queue to the machine, don't you receive a healthy dose of radiation already?

    34. Re:Ethical use of panic... by AioKits · · Score: 1

      This is an excellent post. Until this, I never could see the point in nipple jewelry. You get the pat down without having to look like a terrorist by asking for it. How well do you think it would work for females?

      You do bring up an interesting point, as I have heard some horror stories about women and nipple jewelry at the airport. It does sadden me a tad that my choice of body mods ruins my post for you, but I would like to bring up another point to expand a bit on how selective the process seems to be. I do have body jewelry in 'other' places as well, but was not questioned about those, nor did the pat down even approach their location. And from experience it is less of a pat down, more of a 'let me rub my gloved hands all over you', so that might be more of a deal breaker for women. As someone posted above it's highly likely someone of the same sex will be doing this, but that still doesn't make it enjoyable by any stretch of the imagination. What I wanted to focus on is how could something that couldn't even be mistaken for a hand grenade pin be considered a security risk?

      I do appreciate the insight though.

      --
      "Quote me as saying I was mis-quoted." -Groucho Marx
    35. Re:Ethical use of panic... by Idiomatick · · Score: 1

      Only been on 2 flights lately where I had to layover in the US. And I didn't notice anyone NOT going through the scanners, though I may just be oblivious. It also might be that I'm not from the US but security already makes me feel like a criminal being processed. I definitely wouldn't be comfortable rocking the boat further.

      Though i've never ended up in a backroom for questioning my best friend has. (A hot girl got picked for random inspection and he said yeahhh i'd have gone with her too. His snide remark ended up with him in a backroom for 5hours and questioning by the feds.) I would prefer to not share a similar experience.

    36. Re:Ethical use of panic... by blueg3 · · Score: 1

      Hunh. Well, there may be regional differences or something. I've only been through two airports where they had scanners, and there seemed to be plenty of people who were wary of That There X-ray Thing.

    37. Re:Ethical use of panic... by Chris+Burke · · Score: 2, Interesting

      What is this ethics thing you are talking about and since when was it relevant to fight in a political arena ?

      I'll field this one.

      "Ethics" is the name of one of a number of flags that politicians can drape over their shoulders, automatically causing their arguments to be perceived to represent the trait represented by the flag, and just as importantly their opponent's arguments as being against that trait. Only the first side of an argument to don a given flag receives the benefit, as opposing sides attempting to follow suit are seen as cynical and insincere because they were obviously against the trait to begin with.

      Other flags include but are not limited to "responsibility", "freedom", "concern for children", "dislike of criminals/terrorists", "concern for the poor", and of course "love of country".

      No idea how this fits into the OP's post though. :)

      --

      The enemies of Democracy are
    38. Re:Ethical use of panic... by BitZtream · · Score: 1

      You could always do the intelligent thing and ... you know ... take them out before hand ... naa, that'd be too hard.

      --
      Persistent Volume manager for Kubernetes - https://github.com/dwimsey/openshift-pvmanager
    39. Re:Ethical use of panic... by Anonymous Coward · · Score: 0

      ... but as I stated above, you might be amazed the difference a little attitude adjustment might make.

      In terms of what? Slashdot sympathy or that I'd get pulled aside less often? Because if you're not offering a solution to the latter then I'm afraid it won't be a solution to my problem, if however you are and you're implying that my attitude is the reason for why I get pulled aside then I don't even know how to respond to that. If that is really what you believe is the reason why I get pulled aside when I'm unshaved and wearing sweatpants -- with my middle eastern looks, Persian to be more precise -- then you sir live in a dream world. You wouldn't happen to fit another one in there, would you? I'd love to live inside that world.

    40. Re:Ethical use of panic... by Anonymous Coward · · Score: 0

      If you told them you had a 12 gauge, I'm surprised they didn't question that further! Also, since I can tell you like to cause annoyances with authority figures - aren't there signs - and weren't you told - to remove all metallic objects and place them on the tray? You are potentially give them a reason to rough you up by being wishy washy not following directions!

    41. Re:Ethical use of panic... by Anonymous Coward · · Score: 0

      Dude - regardless of your ethnicity don't travel unshaved and wearing sweatpants. Have a little dignity.

    42. Re:Ethical use of panic... by AioKits · · Score: 1

      Why should I have to take them out? A metal detector won't pick them up. This new device doesn't really add to security, it's just there to make others feel secure. Congratulations, they picked up the nipple ring. Yet the other things were waved on through without incident.

      --
      "Quote me as saying I was mis-quoted." -Groucho Marx
  5. The airport scanners are passive by Anonymous Coward · · Score: 5, Informative

    If you follow the link provided about the airport scanners you find that they are passive devices meaning they don't emit terahertz waves they only recieve the waves coming off of everything around us.
    There are some devices out there that using terahertz radiation to inspect packages much like x-ray today.

    1. Re:The airport scanners are passive by Gadgetfreak · · Score: 4, Informative

      For now. But the last paragraph of the MIT article indicates newer cameras will have their own emitters.

      --
      "No fair, you changed the outcome by measuring it!" - Professor Hubert J. Farnsworth
    2. Re:The airport scanners are passive by Shrike82 · · Score: 3, Informative

      If you follow the link provided about the airport scanners you find that they are passive devices meaning they don't emit terahertz waves they only recieve the waves coming off of everything around us. There are some devices out there that using terahertz radiation to inspect packages much like x-ray today.

      Thankyou. The summary implies that scanning using T-waves in airports might cause you to have your DNA scrambled, which is just plain wrong. Passive scanning (which we are told is what the airport scanners are) don't expose you to any more radiation than you get in a normal day.

      --
      You can advertise in this sig from as little as £99.99 a month!
    3. Re:The airport scanners are passive by TheKidWho · · Score: 0

      Lead is to Rome as Radiation is to ...

    4. Re:The airport scanners are passive by natehoy · · Score: 5, Informative

      The MIT article has no citations to any models coming out that use active scanning. Meanwhile, the article summary clearly implies, no, actually STATES, that they are being introduced already into airports. Which is patently false. Active scanners ARE being introduced, but they are milliwave body scanners, and these passive t-wave scanners appear to be a more effective and safer alternative.

      "With terahertz scanners already appearing in airports and hospitals, the question that now urgently needs answering is what level of exposure is safe."

      The "terahertz scanners already appearing in airports", like the cited ThruVision T5000, are passive units. There is no discussion about "what level of exposure is safe" because there is no exposure to terahertz radiation. It's detecting what your body and possessions are already emitting.

      The t-band scanners are being tested for two reasons that seem to make sense to me, at least:

      1. Their imagery can detect materials more accurately whilst simultaneously not getting as accurate a picture of the actual body. This is better scanning with better privacy.
      2. The new scanners are passive t-ray detectors as opposed to active milliwave detector.

      Better scanning, less violation of privacy, no active emitter. If true, this sounds like a trifecta to me. I'd much rather pass through one of these than a milliwave unit.

      If and when ACTIVE t-band scanners start being introduced into general airport use, I'll share your concern and be right there with you in the pat-down line.

      --
      "This post contains words, known to the State of California to cause thought. Wash brain thoroughly after reading."
    5. Re:The airport scanners are passive by TheCarp · · Score: 2, Interesting

      > Better scanning, less violation of privacy, no active emitter. If true, this sounds like a
      > trifecta to me. I'd much rather pass through one of these than a milliwave unit.

      I would rather pass though none at all. It all looks like one big barrel of privacy invading pork to me. A costly solution to an imaginary problem. That leaves us all with less privacy, to absolutely no benefit to anyone except the people with cushy TSA jobs.

      -Steve

      --
      "I opened my eyes, and everything went dark again"
    6. Re:The airport scanners are passive by Anonymous Coward · · Score: 5, Informative

      Disclaimer: I am an expert in millimeter-wave and terahertz imaging systems.

      I wanted to emphasize to everyone reading this is that the parent is exactly right. ThruVision (the only commercial terahertz imaging system currently in airports) is passive, in that it detects the blackbody radiation being emitted by your body, clothes, and other objects, and compares it to the blackbody radiation of the background. The apparent difference in radiometric temperature is what constitutes the final image. There is no emission of terahertz radiation by this system.

      On the other hand, the active microwave systems, which operate around 35 GHz (there are variations on this, of course) are essentially an active radar system. You are exposed to some non-ionizing radiation, and its reflection from your body, clothes, and other objects is received and compiled to create an image. In terms of radiation, then, the active microwave systems are irradiating you, but at a level far below your cell phone. I can give citations if you like (or refer to the SPIE conference publications by the Pacific Northwest National Lab group who pioneered the system that is currently in airports.)

      Or we can talk about privacy. The active microwave systems have far better spatial resolution than the passive terahertz systems, since they take full advantage of phase in the imaging, and have a great SNR due to transmitting their own microwave power. (the passive systems mostly use direct detectors, which are really only sensitive to the magnitude of the radiation. ThruVision's, though, uses a heterodyne receiver, and thus is quite sensitive, but since it is very narrow-band [340 GHz, +/- 5 GHz], its sensitivity is similar to a direct detector) Fancy radar algorithms give you spatial resolution far better than the diffraction-limited optics definition you are probably used to hearing about. On the other hand, the passive terahertz systems are limited by the diffraction limit, and thus their operational wavelength gives you a good idea of their spatial resolution.

      You would then say that a passive terahertz system operating at 1 THz would give you much better images than a passive system at 340 GHz, and in terms of spatial resolution you are right. However, it is commonly known that clothing transmittance drops off quickly as frequency increases from 100 to 1000 GHz (and of course even more at higher frequencies, which is why you don't see thermal IR cameras being used to detect ceramic knives under your clothes). So, somewhere between 100 and 1000 GHz is a happy medium in terms of spatial resolution AND being able to see through multiple layers of clothing.

      And yes the parent was also right that the passive terahertz systems are very bad at gathering an image of the body, since it is essentially isothermal. No radiometric temperature contrast? No image.

      One thing that everyone has missed is the amount of power needed to "unzip" DNA with terahertz frequencies. (TFS poses this question, actually. The answer is in the arxiv article.) It's actually quite high, and it is very difficult to find a source that can emit this level of power. Yes, there are terahertz lasers (at the several microwatt level), but you should be more afraid of a 10 micron CO2 laser that will punch a hole through your chest, and is also quite invisible.

    7. Re:The airport scanners are passive by breadstic · · Score: 1

      Thank you for that...

      I feel the summary needs to be somewhat rewritten... All of this was unclear without RTFAs and there was not chance of me doing that. There were 3 for god's sake! That could have taken almost 10 minutes!

    8. Re:The airport scanners are passive by Anonymous Coward · · Score: 3, Informative

      I replied to the parent as AC also, just so you get an idea of who this is.

      I wanted to clarify again: the microwave systems are NOT passive. If it looks like this, it is an active microwave system, basically a radar. (I have to question their sanity in that the URL contains "xray"... real smart guys, real smart.) These systems produce images like this.

      Passive narrowband terahertz systems produce images like this. (this is actually one of ThruVision's... it's in an SPIE conference paper from a few years back.) Passive broadband terahertz systems produce images like this. As the parent said, passive terahertz is the way to go, but IMHO, only broadband actually works very well.

    9. Re:The airport scanners are passive by natehoy · · Score: 1

      For the record, agreed. However, scanning of you and your luggage is here to stay. Whether it's truly useful or not, it FEELS useful and it's not going to go away.

      A passive t-band scanner sounds (according to the articles) like you could pretty much walk through it fully clothed and carrying your luggage, and the scanner would simply be looking for markers that indicate explosive or otherwise dangerous substances.

      In other words, you'd walk through a tunnel single-file for airport security, instead of waiting in a line and taking your shoes off and putting your stuff on an x-ray belt.

      Heck, you might even be able to carry water into security again.

      This sounds like a "make the best of a bad situation" solution, that increases the detection of bad stuff while reducing the delays involved in getting through security.

      And if it can truly detect substances accurately, it might possibly catch real threats that the current inspection system could easily miss.

      --
      "This post contains words, known to the State of California to cause thought. Wash brain thoroughly after reading."
    10. Re:The airport scanners are passive by Anonymous Coward · · Score: 0

      Actually I replied to this guy. My bad.

      (PS, slashdot really doesn't like people who post comments quickly...)

    11. Re:The airport scanners are passive by dissy · · Score: 1

      I would rather pass though none at all. It all looks like one big barrel of privacy invading pork to me. A costly solution to an imaginary problem. That leaves us all with less privacy, to absolutely no benefit to anyone except the people with cushy TSA jobs.

      For privacy reasons yes.

      For the current topic of terahertz waves and safety however, no.
      Removing the scanners will not in any way change how much terahertz radiation you are exposed to, it will be the exact same amount.

    12. Re:The airport scanners are passive by TonyJohn · · Score: 1
      Manchester airport is now using a scanner from Rapiscan Systems (ref: BBC).

      Their Secure1000 system claims to be active (from here): "The Rapiscan Secure 1000’s patented technology is composed of an ultra low-dose X-ray source that images backscattered X-rays through to a remote operator’s workstation."

      --
      Owl tried to think of something wise to say, but couldn't.
    13. Re:The airport scanners are passive by natehoy · · Score: 1

      Right.

      Is this an active t-band scanner as the article is trying to promote worry about? No, this is an x-band scanner. We know about the dangers of x-rays, and we know that low doses of them are relatively safe. You'd still find me in the "frisk me" lane if my only option was an active scanner (regardless of band).

      But, according to what I've read, the current crop of passive t-band scanners are being developed to replace the very device you refer to - active x-band units.

      The summary clearly states that active t-band scanners may represent a new hazard, which is probably realistic given that this is a pretty darned energetic wave and has some good penetrating power.

      But then the summary states that active t-band units are currently going into production, which is not, at least to my knowledge, true.

      Yes, active scanners exist in airports. But not active t-band. Passive t-band is currently in testing for airports, in the hopes of replacing some of the active x-band units. Passive t-band is safer than active x-band.

      Active t-band, if it is ever used on humans, will probably be reserved for medical use where the risks to certain patients are outweighed by the need for information right now.

      I do believe that we need to push for some clear labeling on these machines that can be read from a distance.

      If I see a bunch of people strolling through a scanner lane and a long line at the "frisk me" line, I'd like to know whether I'm being asked to choose an active or passive scanner and what band it is employing so I can make my own choice.

      If it's a passive unit, I'm whisking right on through it with nary a thought. If it's active unit and I travel a lot, I'm going to limit my exposure - maybe only choosing it on days when I'm truly rushed, or whatever.

      --
      "This post contains words, known to the State of California to cause thought. Wash brain thoroughly after reading."
    14. Re:The airport scanners are passive by Anonymous Coward · · Score: 0

      A "Terahertz" scanner is a millimetre wave detector. 1THz is 0.3mm wavelength.

    15. Re:The airport scanners are passive by Anonymous Coward · · Score: 0

      A "Terahertz" scanner is a millimetre wave detector. 1THz is 0.3mm wavelength.

      Your units and numbers are correct, but "millimeter-wave" generally refers to lower frequencies, say, 30-100 GHz or so. (to those in the microwave engineering community) Some people will say 30-300 GHz (EHF). The range from 100 GHz to 10 THz has been called the "millimeter-wave/terahertz" frequency region, by some recent NRC reports. We in the terahertz community tend to yield to the experts on those panels... usually very smart old-timers who have been around since the invention of radar (millimeter-wave), and saw the birth (and multiple re-births) of this "newfangled" terahertz thing (sarcasm) that rears its head every 5-10 years. The radio astronomers used to call 300-1000 GHz "submillimeter-wave", which is accurate as well, but the "submillimeter-wave" term is really on its way out, with "millimeter-wave" going up to 100-300 GHz, and "terahertz" going from 100 GHz to 10 THz (or higher). If you want to get picky, "thermal imaging" is just 30 THz, but we also tend to call it long-wave infrared.

    16. Re:The airport scanners are passive by BitZtream · · Score: 1

      There is no emission of terahertz radiation by this system.

      Bullshit.

      They may be designed to be shielded and not emit anything, but anyone with any clue about RF knows that if your receiving, you've got an oscillator thats generating it, and shielding is never 100%

      I'm not saying its a concern, but its a lie to say its not emitting anything.

      --
      Persistent Volume manager for Kubernetes - https://github.com/dwimsey/openshift-pvmanager
    17. Re:The airport scanners are passive by Anonymous Coward · · Score: 0

      Yes, and that oscillator just happens to be your own body.

    18. Re:The airport scanners are passive by Anonymous Coward · · Score: 1, Interesting

      Disclaimer: This is the parent AC who DOES know a thing or two about RF. So here we go.

      Apparently you haven't used a millimeter-wave/terahertz heterodyne receiver lately.

      The most common systems have a W-band local oscillator with output power in the 10-100 mW range. Mixers these days have approximately 100 dB isolation between the LO and RF port. Since a millimeter-wave/terahertz heterodyne receiver is comprised of several stages (let's be realistic and say 3, for the 340 GHz system), we now have 300 dB reduction from (I'll give you the max) 100 mW.

      While you are technically correct that nothing is perfect, if you can detect this amount of power, you will walk away with the Nobel prize in physics. The reason is simple - there are no detectors or systems that have that kind of sensitivity.

      Just so we're clear on the math, that's 10^-31 W at approximately 100 GHz. The NEP of a "good" room-temperature detector is around 10^-12 W*Hz^-.5, and a "good" cryogenic detector perhaps 10^-18 W*Hz^-.5. We can beat down noise, but only as the square root of integration time. NEP is referenced to 30 ms, usually, so let's see - we need 13 orders of magnitude for a cryogenic system, and 19 for a room-temp system. Let's figure out how long we need to integrate... sqrt(BitZtream_integration_time)/sqrt(30 ms). 1 year of integration time will get you just over 4 orders of magnitude, which sounds great. The crappy part is, like I said, that noise only goes down as the square root of integration time. Thus, for even the cryogenic system where you only need 13 orders of magnitude in sensitivity, we'd have to integrate for something like 10^17 years, which is a factor of 7*10^6 greater than the age of the universe. I'm definitely not going to be doing that experiment tomorrow in the lab!

      So sure, you're right, nothing's perfect. Oscillators DO leak through mixers. But if we can't detect it with systems on earth, then it's really just a figment of your imagination, or my calculations, or something like that.

    19. Re:The airport scanners are passive by Anonymous Coward · · Score: 0

      The radio astronomers used to call 300-1000 GHz "submillimeter-wave", which is accurate as well, but the "submillimeter-wave" term is really on its way out

      Good thing, too! It's much much more useful to discuss this radiation as having apparent mass-energies in the range of 1239 microeV/c^2 - 4133 microeV/c^2!

      Going further, wavelength is a backwards unit: set c = G = hbar = k_e = 1 (retaining the second as the unit of length in all four dimensions in our standard 4+1 spacetime) and among other useful things the reciprocal of your wavelength (i.e., wavenumber) stands out clearly as the metric for momentum. Moreover, with this sort of geometrization of units you can talk about rest masses and mass-energies as length (in seconds) without worrying about how everyone manages to forget whether to include or omit the c^2 term when talking about electron volts with respect to particles and/or fields related to electromagnetism. This dramatically simplifies theory and interpretation of *all* EM observation of cosmological and most astrophysical phenomena.

  6. oh no, this means by StripedCow · · Score: 2, Funny

    that besides my geiger muller counter, my gas spectroscopy meter, and my decibel meter, I have to carry a terahertz microwave detector with me all the time?

    --
    If Pandora's box is destined to be opened, *I* want to be the one to open it.
    1. Re:oh no, this means by bipbop · · Score: 3, Funny

      Build and sell a four-in-one! You can be your first customer!

  7. Incident at LAX by BadAnalogyGuy · · Score: 2, Interesting

    I was at LAX with my family several months ago and there was a huge line to go through the metal detectors. Tempers were up, to say the least.

    Ahead of me there was a group of Arabs, kaffiyeh, long beard, the works. Behind them was a little white haired lady apparently on her way back to "Mizzurah" after seeing her grandkids in LA. Sweet as can be old lady, the kind that talks to much to strangers on the airplane. Single serving friend, you know.

    Guess who gets stopped by the TSA.

    Needless to say, everyone in line was a bit pissed that the TSA was giving extra screening to the old lady when they just waved the Arab guys through without a second glance. That's when the guy behind me yelled out, "What the fuck are you morons searching her for? The towelheads are the ones flying shit into buildings!"

    Turns out we were all on the same flight to Chicago. Real American guy boarded last, about 15 minutes late. TSA had a word with him, I suppose. Maybe scanned him a few extra times to make sure his DNA was totally fucked up.

    1. Re:Incident at LAX by Geoffrey.landis · · Score: 1
      I have to say that the only time I was set aside to be in the special search category, everybody else in the group was from the middle-East or India. It was quite clearly obvious that they were profiling based on ethnic origin.

      (*In my case, the "profile" was that I'd bought a one-way ticket only one hour before the flight. Apparently the profile of terrorists is that they buy tickets at the last moment. True? Probably not.)

      --
      http://www.geoffreylandis.com
    2. Re:Incident at LAX by swarsron · · Score: 2, Interesting

      so you suggest we profile people by their religion *and* create an easy to circumvent security protocol? Genius

    3. Re:Incident at LAX by Anonymous Coward · · Score: 1, Insightful

      Might not be for bomb reasons, could be smuggling of drugs, money or other materials. If I was running a security service, I'd find it unusual that someone buys a one-way ticket one hour before a flight. At least enough to frisk them for goodies.

    4. Re:Incident at LAX by gad_zuki! · · Score: 3, Insightful

      >Needless to say, everyone in line was a bit pissed that the TSA was giving extra screening to the old lady when they just waved the Arab guys through without a second glance.

      Err, racial and religious profiling has serious drawbacks. Random testing along with metal detectors, milimeter scan, etc is a better way. Not to mention terrorists arent stupid. Theyre not going to dress up in full garb. The 9/11 hijackers wore street clothes and business casual clothes.

      Terrorists and drug smugglers also prey upon the weak and stupid. I can remember how many times Ive been asked to "hold my bag please, it is a package for my son" in line to get on a plane or a train.

      >"What the fuck are you morons searching her for? The towelheads are the ones flying shit into buildings!"

      Stay classy.

      >Maybe scanned him a few extra times to make sure his DNA was totally fucked up.

      With what exactly? The passive metal detector and passive millimeter wave device? Perhaps it would behoove us all in air travel if didnt point at funny looking people and scream "terrorist" like the moron in your story.

    5. Re:Incident at LAX by Anonymous Coward · · Score: 0

      I have to say, it is usually the old lady sitting next to me, who just can't shut up, who makes me really wanna cut my veins on those long coast to coast flights. But I've never been seated next to a "towelhead", so I have no data for comparison

    6. Re:Incident at LAX by Anonymous Coward · · Score: 0

      I can't recall the source, but I heard of an interview of someone from airport security in Israel. When asked why there weren't more incidents when they are certainly targets, he said, "In America, they look for bombs. Here we look for bombers."

      So they let the 9/11 hijackers on the plane with mace and box cutters, but they harass my 67 year old mother every time she flies. Anything else wouldn't be Politically Correct.

    7. Re:Incident at LAX by Anonymous Coward · · Score: 0

      In my case, the "profile" was that I'd bought a one-way ticket only one hour before the flight. Apparently the profile of terrorists is that they buy tickets at the last moment. True? Probably not.

      When you buy tickets last minute you get the "SSSS" treatment because they don't have enough time to run your name through all their databases.

    8. Re:Incident at LAX by eyrieowl · · Score: 1

      You know, it occurs to me that this is partly why our air security is a mess: it is looking for too many things. Why is the TSA involved in looking for drugs, or parrots strapped to your crotch, or all those other things which DON'T endanger airplanes and passengers? Air security should focus solely on that, and leave law enforcement of other laws to the other relevant law-enforcement agencies. I think it's a clear example of a situation where being generalists is bad and where being a narrow specialist is good. When I'm on an airplane, I really could care less if the guy next to me is smuggling 10 billion dollars in his left shoe...I'm all for catching criminals, but I don't think the air-safety checkpoint is the best place to be doing it.

    9. Re:Incident at LAX by rockNme2349 · · Score: 2, Insightful

      Makes sense to me. If I was going to hi-jack a plane I wouldn't dress up like a stereotypical terrorist. Its going to be the seemingly innocent ones who are going to sneak things on.

      --
      Sewage Treatment Facilities - "Our duty is clear."
    10. Re:Incident at LAX by bill_mcgonigle · · Score: 1

      Random testing along with metal detectors, milimeter scan, etc is a better way

      It's still not significantly protective (>40% of test goods get through) and imparts a massive cost. There is no good way because there is no real problem. People proved that over a field in AZ. And now all the cockpit doors are hardened so 'small pointy things' are not a threat. Heck, put five smart people in a room and they'll figure out a few protocols for getting past security.

      So we're trading our liberty and money for absolutely nothing in return.

      --
      My God, it's Full of Source!
      OUTSIDE_IP=$(dig +short my.ip @outsideip.net)
    11. Re:Incident at LAX by bill_mcgonigle · · Score: 1

      that over a field in AZ

      um, blame the cold meds. PA. :P

      --
      My God, it's Full of Source!
      OUTSIDE_IP=$(dig +short my.ip @outsideip.net)
    12. Re:Incident at LAX by Dragonslicer · · Score: 1

      that over a field in AZ

      um, blame the cold meds. PA. :P

      Well, the 'P' and 'Z' keys are practically right next to each other.

    13. Re:Incident at LAX by bill_mcgonigle · · Score: 1

      Well, the 'P' and 'Z' keys are practically right next to each other.

      hey, there must be some alternate keyboard-layout where that's true!

      Unfortunately, I must honestly settle on 'addle-mindedness'.

      --
      My God, it's Full of Source!
      OUTSIDE_IP=$(dig +short my.ip @outsideip.net)
    14. Re:Incident at LAX by BitZtream · · Score: 1

      I can remember how many times Ive been asked to "hold my bag please, it is a package for my son" in line to get on a plane or a train.

      Really? Thats never happened to me, ever. I guess you appear weak and stupid?

      --
      Persistent Volume manager for Kubernetes - https://github.com/dwimsey/openshift-pvmanager
    15. Re:Incident at LAX by commodore64_love · · Score: 1

      You have been unfairly modded into invisibility as a "troll", which is completely ridiculous, so I'm reposting your message so people can see it. It's a good story about the Stupidity of the TSA.

      I was at LAX..... Ahead of me there was a group of Arabs, kaffiyeh, long beard, the works. Behind them was a little white haired lady apparently on her way back to "Mizzurah" after seeing her grandkids in LA. Sweet as can be old lady.....

      Guess who gets stopped by the TSA.

      Needless to say, everyone in line was a bit pissed that the TSA was giving extra screening to the old lady when they just waved the Arab guys through without a second glance. That's when the guy behind me yelled out, "What the fuck are you morons searching her for? The towelheads are the ones flying shit into buildings!" Real American guy boarded last, about 15 minutes late. TSA had a word with him, I suppose.

      I guess that little old lady was a real danger, as if she was about to yell out "Death to Americans" and blow up the terminal. (rolls eyes). They also stopped this guy who looks like an adult version of Harry Potter! With guy's photo - http://www.youtube.com/watch?v=XMB6L487LHM [youtube.com]
      unedited - http://www.youtube.com/watch?v=tEJpzVPmih0 [youtube.com]

      --
      "I disapprove of what you say, but I will defend to the death your right to say it." - historian Evelyn Beatrice Hall
    16. Re:Incident at LAX by Anonymous Coward · · Score: 0

      These scanners usually measure the Thz radiation emitted from the human body (thats how they see through your clothes). They are passive. About 1 watt for anyone who is alive and warm. There are Thz waves everywere and certainly you will be subjected to more when you fly and sit next to someone then any scanner will give you. There are active scanners too but they emmit microwats and due to the way they measure the radiation is far less than in the background and they cant be used to scan a body because it takes to long to measure point by point. These waves are not new its just we can now measure them. The DNA issue is like compairing damage from a laser beam to a light bulb. Its all about the power. The sun is by far the greatest emmiter of all types of radiation. At the moment the gvmt doesnt control the emission from that!

    17. Re:Incident at LAX by Anonymous Coward · · Score: 0

      Not to mention terrorists arent stupid. Theyre not going to dress up in full garb. The 9/11 hijackers wore street clothes and business casual clothes.

      Ah, but now the terrorists know that the TSA know that, so they will dress up in full garb to fool the TSA into letting them through.

  8. Remember it's resonance by Anonymous Coward · · Score: 1, Insightful

    Resonant effects build up from very small amplitudes; the 'safe' level of exposure from a CW machine is none.

    1. Re:Remember it's resonance by Sockatume · · Score: 2, Interesting

      Actually, the article states that "THz-radiation can affect biological function, but only under specific conditions, viz. high power, or/and extended exposure, or/and specific THz frequency". At any rate resonant absorbance does not, as a common property, "build up from very small amplitudes" outside of Star Trek. It's a way of getting energy into particular modes of the system, which can ensure you put the energy in the place where it'll do the most good (or bad), not a way of boosting that energy.

      --
      No kidding!!! What do you say at this point?
    2. Re:Remember it's resonance by Bigbutt · · Score: 1

      That's cool. So only the guys and gals that work at the airport will mutate. And hey, if you didn't want to mutate, you shouldn't have applied to work at the airport.

      (Yes I know that the article says it's passive, I'm responding to the comment.)

      [John]

      --
      Shit better not happen!
    3. Re:Remember it's resonance by Sockatume · · Score: 1

      I imagine that the folk at the airport would be given an occupational exposure limit and told to stand behind the emitter when they're not being scanned themselves.

      --
      No kidding!!! What do you say at this point?
    4. Re:Remember it's resonance by mea37 · · Score: 1

      Uh... resonance doesn't "boost" energy, but it does allow it to pile up in one place (which can effectively boost power). GP's characterization may be a little sloppy, but if I had to pick his statement vs. your claim that his statement is science fiction, I'd go with him.

      For a somewhat dramatic example: There was a MythBusters episode talking about the supposed "earthquake machine" that Tesla is sometimes said to have created. They built a machine that would tap at whatever frequency they set, attached it to a bridge, and started tuning. Of course they did not reproduce the supposed Tesla results - which are absurd; if they thought it were possible they wouldn't be standing on the bridge - but they did (to Jamie's surprise) find a frequency at which the vibration of the bridge increased over time, to a point well beyond what a light tap from their machine would produce. Of course it would not have increased without bound - there are physical limits and complexities in the structure.

      But: what was happening? The enrgy of each tap was being held in the structure of the bridge, each subsequent tap was adding to it faster than it could naturally dissipate, and it was "building up" to create motion waves they could feel at considerable distances.

      This is why it takes a sustained note at a particular frequency to shatter glass.

    5. Re:Remember it's resonance by russotto · · Score: 1

      For a somewhat dramatic example: There was a MythBusters episode talking about the supposed "earthquake machine" that Tesla is sometimes said to have created. They built a machine that would tap at whatever frequency they set, attached it to a bridge, and started tuning. Of course they did not reproduce the supposed Tesla results - which are absurd; if they thought it were possible they wouldn't be standing on the bridge - but they did (to Jamie's surprise) find a frequency at which the vibration of the bridge increased over time, to a point well beyond what a light tap from their machine would produce. Of course it would not have increased without bound - there are physical limits and complexities in the structure.

      It won't increase without bound because bridge designers, all having seen the Tacoma Narrows film, make damn sure they design them so it won't.

      There's no particular reason a continuous input at a given frequency can't cause oscillations which increase until something breaks.

    6. Re:Remember it's resonance by Sockatume · · Score: 1

      You're limited by energy loss by coupling to the non-resonant modes, though. That's why amplitude is important, and resonant effects will not "build up" from an arbitrarily small amplitude. The resonance gets the energy into the mode with great efficiency, it doesn't keep it there.

      --
      No kidding!!! What do you say at this point?
    7. Re:Remember it's resonance by Sockatume · · Score: 1

      And, to conclude the thought, the resonant mode in this paper is not one (like that which can break a bridge, or a wine glass) for which there are few modes to couple to and thus lose the energy. That's why there's a critical amplitude below which the frequency does not cause "bubbles".

      --
      No kidding!!! What do you say at this point?
    8. Re:Remember it's resonance by mea37 · · Score: 0

      If you're taking issue with the notion that the input can be "arbitrarily small", that's fine. Input has to exceed dissipation. In the context of t-waves resonating with DNA, I'm not going to attempt to comment on what the threshold would be.

      However you seem to be taking issue with the phrase "build up", which I do not understand as that is exactly what happens.

    9. Re:Remember it's resonance by Sockatume · · Score: 1

      The OP's statement was that "the safe level... is none", on the basis that it's resonant and thus can "build up" to an arbitrarily dangerous level regardless of exposure, the impression being that (as in Star Trek) you can just energetically tap something once, the right way, and it'll shake itself to pieces. That's what I had a problem with. I don't have an issue with "building up" energy, because not only does it happen with resonant processes, it happens with thermal processes too: if you dump in energy faster than it can be dissipated, you'll excite any given mode. Resonant processes just happen to be more efficient.

      --
      No kidding!!! What do you say at this point?
    10. Re:Remember it's resonance by jeffb+(2.718) · · Score: 2, Informative

      There's no particular reason a continuous input at a given frequency can't cause oscillations which increase until something breaks.

      Yes, there is. It's called "dissipation".

      As something wiggles, it tends to leak energy into its mounting points or the medium surrounding it. In some cases, like Tacoma Narrows, energy can't dissipate as quickly as it accumulates, and that's when you get structural failure. Engineers strive to predict these vibrational modes and design their structures so that dissipation will always exceed accumulation before the resonance causes damage.

    11. Re:Remember it's resonance by mea37 · · Score: 0

      While I agree the OP was sloppy in his belief that the safe level is 0, your inference that he assumed you could "tap something once" and get a result shows that you didn't read his post carefully, or else don't understand what CW means.

      And if we're talking about being sloppy, your claim that energy "doesn't build up" in resonance is equally sloppy.

  9. This Transmission is Coming to You... by Merakis · · Score: 0

    Whether you like it or not, your DNA will be modified by our scanners. Signed, The G-Man.

  10. great. they invented a 'cancer gun' by Anonymous Coward · · Score: 0

    what could possibly go wrong!

    reminds me of 'saturday morning watchmen'.

  11. In most cases, airport scanners are still optional by MadCow42 · · Score: 5, Informative

    The times I've encountered the terahertz scanners at airports, they've always been optional (although they don't make it clear to you that it is). If directed to one, I've always simply asked if I must use it or if I had a choice of a "normal" metal detector. EVERY time they've allowed me to choose (and I travel a LOT). Most times they take a note of it or ask me to sign a sheet to indicate my declination - I assume so they can figure out if people object or not.

    Asking the quesiton never hurts. It also sends the message that this intrusion isn't accepted by the public. Don't surrender to these things willingly.

    --
    I used to have a sig, but I set it free and it never came back.
  12. Translation by commodore64_love · · Score: 2, Informative

    "This creates bubbles in the strands that can significantly interfere with processes such as gene expression and DNA replication." i.e. The birth of cancer cells. Terahertz waves are carcinogens.

    --
    "I disapprove of what you say, but I will defend to the death your right to say it." - historian Evelyn Beatrice Hall
    1. Re:Translation by Anonymous Coward · · Score: 0

      People don't realize it, but our bodies birth cancerous cells constantly. We usually kill them off, though.

    2. Re:Translation by commodore64_love · · Score: 4, Insightful

      >>>People don't realize it, but our bodies birth cancerous cells constantly. We usually kill them off, though.

      Yes but irritants (like tobacco smoke) create MORE cancerous cells, and therefore increase the odds you'll die of cancer. The solution is to avoid those things that encourage cancerous growth.

      --
      "I disapprove of what you say, but I will defend to the death your right to say it." - historian Evelyn Beatrice Hall
    3. Re:Translation by Sockatume · · Score: 2, Informative

      That would depend on the degree. Your DNA's a mess at the best of times from exposure to the normal background of crap, and would be a mess in isolation by its very nature. The body has coping mechanisms: the question is, is this significant enough to pose them problems? The answer, according to this paper's lit review, is "sometimes, at a high enough or sufficiently prolonged level of exposure or at a particular frequency".

      --
      No kidding!!! What do you say at this point?
    4. Re:Translation by put_the_cat_out · · Score: 3, Interesting

      But what if Terahertz waves can also be used to kill a cancerous tumor? Think about this ... take to sources of focused EM energy beams, neither in the Terahertz range, and aim both energy beams at a cancerous tumor. When the two energy beams coincide at the tumor, through constructive interference, localized Terahertz waves are generated that disrupt the DNA of the cancer cells to the extent that those cells can no longer replicate. Since the energy is localized, damage to the surrounding body tissue is minimal and can be repaired by the body in a short time. As a result though, the cancer is gone.

    5. Re:Translation by ZombieWomble · · Score: 1

      (T)ake to sources of focused EM energy beams, neither in the Terahertz range, and aim both energy beams at a cancerous tumor. When the two energy beams coincide at the tumor, through constructive interference, localized Terahertz waves are generated that disrupt the DNA of the cancer cells

      That is not how interference works - interference modifies the intensity of the beam, that is the number of photons which would be observed at any given point. It does nothing to the energy of the photons - interfering light only gives light, interfering microwaves only gives microwaves, and so forth.

    6. Re:Translation by Anonymous Coward · · Score: 0

      No, mutagen =/= carcinogen. Terahertz waves MAY be mutagenic but it will take a lot more research to see if they are potential carcinogens.

    7. Re:Translation by Sockatume · · Score: 1

      Incidentally, the idea of frequency doubling for therapy is a real thing. IIRC, you put dyes into the target. Then you illuminate with light which is relatively long-wavelength, so that tissues are transparent to it. The dye does two-photon absorption of this light and then dumps that high energy into the target.

      --
      No kidding!!! What do you say at this point?
    8. Re:Translation by flaming+error · · Score: 1

      That reminds me of an associate's code-writing philosophy. If he finds a bug in his software, he mentally flags it to be fixed. But if he finds a second bug nearby, he figures that second bug will probably counteract the first, and checks the code in.

    9. Re:Translation by Anonymous Coward · · Score: 0

      I Am Not A Physicist, but I don't think interference can be used to synthesize components at frequencies that didn't already exist in the pre-interference signal.

    10. Re:Translation by BitZtream · · Score: 1

      I love people who use tobacco smoke as an example. You inhaled more carcinogens from the car you drove to the airport than most smokers do with first hand smoke.

      --
      Persistent Volume manager for Kubernetes - https://github.com/dwimsey/openshift-pvmanager
    11. Re:Translation by commodore64_love · · Score: 1

      Cars do produce a lot of carcinogens (~0.1 grams of NOx and particulates per mile), but it's still smokers who end-up with lung cancer or nose cancer or throat cancer most often. Smoking is far more deadly

      --
      "I disapprove of what you say, but I will defend to the death your right to say it." - historian Evelyn Beatrice Hall
  13. Are you mad?!?!? by elrous0 · · Score: 4, Funny

    You would deprive us of hundreds, if not thousands, of leaked nude photos of famous celebs just to save a little DNA?!?!? Are you insane, man????

    --
    SJW: Someone who has run out of real oppression, and has to fake it.
    1. Re:Are you mad?!?!? by Anonymous Coward · · Score: 1, Funny

      Are *you* mad!? Do you know the amount of leaked DNA caused by leaked nude photos of celebrities? This could result in a feed back loop causing a massive snowball effect that could destroy the entire human race (or at least be really gross)!

    2. Re:Are you mad?!?!? by ragefan · · Score: 4, Funny

      You would deprive us of hundreds, if not thousands, of leaked nude photos of famous celebs just to save a little DNA?!?!? Are you insane, man????

      I'm thinking either way, there is gonna be some DNA lost.

    3. Re:Are you mad?!?!? by bill_mcgonigle · · Score: 1

      You would deprive us of hundreds, if not thousands, of leaked nude photos of famous celebs just to save a little DNA?!?!? Are you insane, man????

      Y'know, there's a reason that there aren't really that many pin-up girls or porn stars. Be careful what you wish for - Michael Moore flies too.

      --
      My God, it's Full of Source!
      OUTSIDE_IP=$(dig +short my.ip @outsideip.net)
  14. Zero-tolerance? Really? by jeffb+(2.718) · · Score: 0

    Well, since every gram of tissue in your body is constantly emitting blackbody terahertz waves, I guess you're screwed, then.

  15. I would like to contribute to the solution by iamacat · · Score: 1

    Now where do I go to buy a camera that can virtually unzip people so that I can go do some research on it's side effects?

    1. Re:I would like to contribute to the solution by pwfffff · · Score: 1

      This is like the fourth story I've read on the scanning technology and I just now wondered if anyone's tried to put it in goggle form. Who would have thought the X-ray specs came before the flying cars? What a weird future.

  16. This never would have happened by sleeponthemic · · Score: 0, Offtopic

    If we'd have gone with velcro.

    --
    I record my sleeptalking
    1. Re:This never would have happened by MrKaos · · Score: 1

      OT:I was checking out your site - hope the comments help

      --
      My ism, it's full of beliefs.
  17. there was a little old lady in the UK who turned by Anonymous Coward · · Score: 1, Informative

    out to be one of the biggest spies for the soviet union during the cold war.

    dont mess with little old ladies.

  18. Doesn't worry me by Dolphinzilla · · Score: 3, Interesting

    If you read the story this conjecture is the results of a computer model ...NOT real measurements of actual damage to DNA - since no previous actual experiments have turned up any damage then I'd say the model is not quite right - at any rate its all theoretical and not proven with experiment

    1. Re:Doesn't worry me by _LORAX_ · · Score: 3, Insightful

      This is good science. It gives experimental research a direction to look in. If they find the same result it will validate this computer model, if they still can not the computer model needs to be thrown out or reworked. There will always be differences between theory and experiment, this is probably just one of those cases.

      It may not matter though, with the number of people that can not differentiate between theory and reality this may stop terahertz scanning dead since people are dumb and panicky when it comes to crap like this. People still think WiFi or cell phones can give you cancer. Better yet, most people can't even tell you the difference between a tumor and cancer and use the terms interchangeably.

    2. Re:Doesn't worry me by Sockatume · · Score: 5, Insightful

      Actually, it's a theoretical explanation for some difficult experimental results. The issue was that some studies suggested that THz radiation would be harmful at any frequency/power range, while others pegged it as only being significant at particular resonant amplitudes or frequencies. It transpires that in the presence of thermal perturbations, you do indeed get some non-specific disruption of the base pairing, which would only be an issue if you had a long enough exposure to actually get a significant thermal perturbation and thus cause a very significant disruption. However there is also a resonant mechanism, at a particular frequency with a critical minimum amplitude, that can immediately cause a significant disruption, without the need to wait for a particularly big thermal perturbation. That's my reading, anyway.

      --
      No kidding!!! What do you say at this point?
    3. Re:Doesn't worry me by Dolphinzilla · · Score: 1

      I agree - we often use models at work to predict what will occur when we build systems - we also try to refine our models with experimental results - I think relative to Terahertz radiation effect on human cells and DNA there is still much work to do, and as you point out there are many who still buy into the cell phone cancer myth. I really hate when a true story of science gets sensationalized and turned into FUD....

    4. Re:Doesn't worry me by radtea · · Score: 3, Interesting

      Actually, it's a theoretical explanation for some difficult experimental results.

      Which itself needs to be experimentally verified. The model they are using is fairly simple. In particular, they introduce the terahertz driving force into the model by hand. That's ok to suggest that under reasonable assumptions it is plausible that terahertz radiation can drive non-linear breathing-mode resonances that can create localized "bubbles" in double-stranded DNA, where the linking bonds between the two strands are broken. But it's a long, long way from a solid empirical result.

      Of course, if you believe GCM's are a sound basis for public policy, you would have to argue that there is no need to do any experimental follow-up on this: simply use the computer model to determine the safe limits. There should be no problem with that because this model is orders of magnitude more realistic than the best GCM.

      --
      Blasphemy is a human right. Blasphemophobia kills.
    5. Re:Doesn't worry me by Sockatume · · Score: 2, Interesting

      Sure, sure, I won't believe it until I see some DFT and experimental results from some actual physical chemists, I'm just pointing out that this isn't a pie-in-the-sky hypothesis. And absolutely, research this early shouldn't drive policy.

      --
      No kidding!!! What do you say at this point?
    6. Re:Doesn't worry me by MightyYar · · Score: 1

      Further, these waves can't pass through water... so unless we're worried about skin cancer I'm pretty sure any health claims are going to be overblown.

      --
      W..w..W - Willy Waterloo washes Warren Wiggins who is washing Waldo Woo.
    7. Re:Doesn't worry me by repapetilto · · Score: 1

      So I dont really understand whats supposed to be going on here. What is absorbing the energy of the photon, and what does resonance have to do with it? To give you an idea of where Im coming from:

        So you have your dsDNA, both strands connected to each other by all those hydrogen bonds... which is basically saying protons are being held between two electrons (one from each complimentary base nitrogen or oxygen) and its energetically unfavorable for the proton to move elsewhere. But of course everything is vibrating around so youll be getting things like changes in the distance the proton is from either Nitrogen or Oxygen of the nucleotides, or changes in the angle at which it sits relative to them, etc. These "vibrations" would be constantly happening, and obviously be also affected by the movements of every other bond (hydrogen, covalent...ones that connecting together the nucleotides, water molecules, all of them) surrounding it. So these vibrations are going to have a certain amount of energy associated with them... so the 2 Terahertz photons have an energy that corresponds to some vibrational energy involved at this level? The way I understand it EM radiation interacts with matter by causing electrons to move farther away from nuclei, this movement of electrons away from and then back towards nuclei and rotation of the molecules the nuclei are part of relative to other nuclei would also be the ultimate causing the vibrations to begin with. So then could you say that that the 2 THz photons are increasing the likelihood of a certain one of these vibrations will occur (for example a push of a proton close enough to an Oxygen on one nucleotide, and thus farther away from the Nitrogen on the complementary nucleotide leading to a breaking of the hydrogen bond) but the 2 THz photon will only get absorbed when that proton is in a certain position relative to the other nuclei, and since its position is in constant flux according to some nonlinear pattern, significant effects will only be seen if a series of 2 THz photons keep hitting it at just the right pattern of timing...

      Im not sure if that makes sense or not but yea, some sort of physical explanation would be nice.

    8. Re:Doesn't worry me by Xyrus · · Score: 1

      "Of course, if you believe GCM's are a sound basis for public policy, you would have to argue that there is no need to do any experimental follow-up on this: simply use the computer model to determine the safe limits. There should be no problem with that because this model is orders of magnitude more realistic than the best GCM."

      Spoken like someone who has no idea what they are talking about. Why don't you go read about how the climate models are constructed, tested, and validated before you start using them as your straw man.

      With something like terahertz radiation, you can build a model and verify with physical experiments in a relatively short amount of time. But with climate models, you have two ways to validate them. One is to run them from some point in the past and see if they give you the climatology of today (this is done already, and well documented). The other is to wait and see if the models that have been validated by historical analysis are also validated by the climate as we move forward. You cannot construct climate experiments in a lab. The Earth is the lab. All you can really do is conduct "simple" experiments to validate the basic physics (fluid dynamics, thermodynamics, chemistry, etc.).

      So now you're faced with the problem. You're model is saying some bad things may happen in the future. You're model has been historically validated and uses the most up to date data and physics available. Do you:

      A) Listen to your model and try to anticipate/prepare for the predicted changes.
      B) Ignore you're model because you have no way to conduct real world experiments other than to wait and see what happens.

      Climate models aren't the only models that have no real experiments that can be performed to validate them other than observational. Galactic models, black hole models, solar system formation models, etc. are all models based on known physics and data, but have no real lab experiments to verify them. And yet they are still very useful in studying "what if" scenarios and modeling known phenomena.

      The big difference between those models and climate models are they don't affect you, so you could care less.

      ~X~

      --
      ~X~
    9. Re:Doesn't worry me by rcw-home · · Score: 1

      some studies suggested that THz radiation would be harmful at any frequency/power range

      We better start cooling our surroundings to absolute zero immediately!

    10. Re:Doesn't worry me by coopex · · Score: 1

      Uh, the models have free parameters, which are "fitted" to past historical data. There's been no standard separation of training and testing sets that's used to verify this type of model.
      Secondly, the models have completely failed to predict, or even replicate the lack of spiraling upward temperatures that should go along with increasing CO2.
      Thirdly, there's a very obvious experiment to perform, calculate spectra of CO2 in the atmosphere, and see if it matches the naive extrapolation used in GCMs.
      Fourthly, the models do not accurately replicate troposphere temperatures.
      Finally, many experimental measurements/calculations, like the standard deviation of temperature and such to find when weather turns into climate have not been done, and just handwaved away with claims that averages are easier to predict.

      GCMs are nothing more than crude weather models iterated past the (experimentally determined ~ 1 week) Lyapunov exponent of the system. But all that doesn't matter because it's just basic principles of computer science and physics, to say nothing of Navier-Stokes, and I'm sure feeling-based science will replace all those "closeminded oil company stooges".

      --
      The road to hell is paved with good intentions.
  19. Do they pass through EVERYTHING? by visualight · · Score: 1

    http://www.google.com/#hl=en&q=%22blocks+terahertz+waves%22

    No results found for "blocks terahertz waves"

    --
    Samsung took back my unlocked bootloader because Google wants me to rent movies. They're both evil.
    1. Re:Do they pass through EVERYTHING? by bipbop · · Score: 3, Funny

      That's odd. I get just one result, from someone named "visualight" on Slashdot!

    2. Re:Do they pass through EVERYTHING? by malakai · · Score: 1
    3. Re:Do they pass through EVERYTHING? by skelterjohn · · Score: 2, Funny

      That slashdotter must be very dense indeed.

    4. Re:Do they pass through EVERYTHING? by blueg3 · · Score: 1

      If they passed through everything, they wouldn't be very useful for scanning, would they?

  20. Re:In most cases, airport scanners are still optio by Lord+Lode · · Score: 1

    All the scanning and waiting in line for it and having luggage checked and so on is such a big time sink. I don't think I'd ask for another detector, because I'm just happy if I'm finally there instead of waiting in line and just want the whole process to be over as fast as possible.

  21. Structural explanation by damn_registrars · · Score: 3, Informative

    The summary mentions that the terahertz waves "tear apart" strands of DNA. For those who might not remember their undergraduate biology, DNA strands are held together by hydrogen bonds - not covalent bonds. So the total amount of force to "tear apart" two strands is not as great as you might imagine. For that matter, strands have to be "torn apart" in order to be replicated for cell division.

    --
    Damn_registrars has no butt-hole. Damn_registrars has no use for a butt-hole.
    1. Re:Structural explanation by Anonymous Coward · · Score: 0

      some studies suggest that the hydrogen bonds are insignificant, and that thestrands are mostly held together by the well-fitting geometry of the matching base-pairs.

      Either way, unzip my DNA and I'll not be pleased. Unless I win the superpowers lottery.

    2. Re:Structural explanation by Sockatume · · Score: 3, Informative

      The authors aren't concerned about it unzipping the entire DNA strand like string cheese. The process creates local regions of unzipping, which your DNA gains and loses as a matter of course. These unexpectedly-open regions interfere with replication and translation, but your DNA can cope with the the "normal amount", so the question is whether these additional regions are enough to be a problem.

      --
      No kidding!!! What do you say at this point?
  22. Side Effects by allknowingfrog · · Score: 0

    I was amused by the summary's mundane description of the horrible side effects.

    "We're sure it's perfectly safe, but in certain circumstances it might unzip your DNA."

    That sounds like a bad thing...

  23. Slashdotted already? by Skapare · · Score: 0, Offtopic

    Maybe they're using the DSL those turtles like slow much.

    --
    now we need to go OSS in diesel cars
  24. Re:In most cases, airport scanners are still optio by Anonymous Coward · · Score: 0

    Yes, that's what they want.

    The elite don't go through the cattle corral. They just walk out on the tarmac from their special gate and get on their special plane that goes directly where they want to go. Specially.

    You rubes are spending half your travel time just getting hassled. Time you might have spent getting rich and powerful if you'd had it available to you. Buses are the same way. Why do you think the schedule will have an hour between buses and two transfers that don't line up each way. Heaven forbid you have two goals for the trip.

  25. just another resonance problem? by Anonymous Coward · · Score: 0

    Sweet they answered how to avoid it as well then. If it is because of resonance you treat it like any other resonance problem and vary the frequency a bit.

  26. My booming smuggling business by tinkerton · · Score: 1

    My business of smuggling illicit recreational chemicals has become so much easier after 9/11. All my people dress with long beards and try to look arab(takes some training). Alright so it's not fun when the man with the glove comes but they never get checked for drugs. I lost a few that were sent to Uzbekistan but hey, it's not supposed to be a safe business.

  27. Double Stranded? by AP31R0N · · Score: 2, Insightful

    i thought all DNA was double stranded. Is there single or triple stranded DNA? If all DNA is double stranded, why mention strandedness at all?

    i'm not trolling, i'm asking a question. Yesterday some jerks with more mod points than sense labeled me as a troll for asking questions.

    --
    Utilizing the synergization of benchmark e-solutions to pre-workaround action items!
    1. Re:Double Stranded? by Nadaka · · Score: 1

      From a recent article I read right here on slashdot, the telomer section of a strand of DNA is supposed to zip itself up as a 4 stranded section to keep the end from getting unzipped. Though I have no idea how accurate that actually is.

    2. Re:Double Stranded? by Sockatume · · Score: 1

      4-stranded DNA's definitely on the cards. Not sure if those are theoretical or experimental cards though.

      --
      No kidding!!! What do you say at this point?
    3. Re:Double Stranded? by Anonymous Coward · · Score: 0

      Single-stranded DNA is commonly found in cells undergoing mitosis (division) and in sperm and egg cells.

  28. *puts on a latex glove* by Anonymous Coward · · Score: 0

    "Hasn't it always been the case that you have the option to decline to use "the machine" and be hand-searched instead?

    Until this issue gets resolved, that's what I plan to do anyhow."

    Ahoy, Matey! Now bend over....

  29. Re:In most cases, airport scanners are still optio by MadCow42 · · Score: 3, Interesting

    Actually, when I decline, they've always walked me to the front of the line for the other detectors. It's saved me time in the end, strangely enough.

    A few other times, when it was my turn, I simply walked to the standard detector myself, and had no issues.

    (they have two normal lanes and one terahertz scanner lane at my departure airport, but I've run into them in many other places recently too)

    --
    I used to have a sig, but I set it free and it never came back.
  30. Not just peeking by Anonymous Coward · · Score: 2, Informative

    They produce a 3-dimensional model of your body that is accurate down to the pores of your skin. They can also see a bit beyond the skin.

    The publicly-released zoomed-out pictures of blue people only show one way of rendering the data that these machines gather. They could just as easily render a full-color image that looks like a photograph, with a fancy zoom feature that will give them intricate detail of any body part they choose to examine.

    1. Re:Not just peeking by Anonymous Coward · · Score: 3, Informative

      They produce a 3-dimensional model of your body that is accurate down to the pores of your skin.

      Ha! No, they don't. In theory you could do this, but not quickly. The data volume alone should make it obvious they aren't doing this. The model you describe would be terabytes in size. On top of that, creating the model would require a huge amount of supercomputer time. There's just no way they are doing this quickly in a line at an airport. I *wish* it was that easy, since my job involves radar imaging.

  31. No problem by Carlitros · · Score: 1

    No problem at all. Just use 528 Hz afterwards. Google it!

    1. Re:No problem by Sockatume · · Score: 1

      I encourage everyone to google 528Hz. What the crap.

      --
      No kidding!!! What do you say at this point?
  32. Grossly simplified, but... by Sockatume · · Score: 4, Informative

    Single-stranded DNA has its information-encoding side exposed and flops around kind of pathetically. Double-stranded DNA sticks the two information-encoding sides together so that they're hidden and inactive, and helps you wind up and store the DNA. However the double strand can "unzip" along a small part of its length to expose two single strands which can go to work.

    You can get triple-stranded DNA, but it's not traditionally been thought of as important. Normally the groove for the third strand would be occupied by proteins involved in the function and maintainence of the DNA instead. However it now seems that forming a triple strand in some regions might be important in DNA's control mechanisms too.

    --
    No kidding!!! What do you say at this point?
    1. Re:Grossly simplified, but... by AP31R0N · · Score: 1

      Thanks!

      +1 Informative!

      --
      Utilizing the synergization of benchmark e-solutions to pre-workaround action items!
    2. Re:Grossly simplified, but... by Anonymous Coward · · Score: 0

      The talk of my DNA's behavior made me squeamish. I guess my blood anxiety has just been extended. I can just see all of those DNA strands being unzipped and falling into a crumped up pile like fabric as I pass through the terrahertz scanner. noooo!

  33. Can you insultate yourself? by mastahYee · · Score: 1

    If you line your clothes with something conductive, would it disperse the waves before reaching skin? What about your house? What about tinfoil? I know little about this stuff, but I'm genuinely concerned about being groped internally. Talk about spooky action from a distance.

    1. Re:Can you insultate yourself? by LWATCDR · · Score: 1

      Calm yourself. Right now the scanners are passive. They just view the background signal that you are emitting all the time. They don't bombard you with THz radiation they just look at what is already there.
      This is research on the next generation of scanners that are not yet in service and may never be now that we found this.

      --
      See my blog http://ilovecookes.blogspot.com/ for light hearted technical information.
    2. Re:Can you insultate yourself? by mastahYee · · Score: 1

      Good to know. Thanks for the info.

    3. Re:Can you insultate yourself? by Anonymous Coward · · Score: 0

      Why, yes, you can. Step 1: Steel yourself. Take a deep breath if you need. Step 2: Look in the mirror. Step 3: Call yourself bad names.
      Congratulations! You've just insultated yourself!

  34. WWDD - what would Dorthy do by Anonymous Coward · · Score: 0

    Dorthy, I'll get you and your little dog too.
    Walk thru this airport scanner before I board my broom. Ok.

    Oh NO... I'm Melting...

  35. Re:there was a little old lady in the UK who turne by kilfarsnar · · Score: 1

    Good point. Julia Child was CIA after all!

    --
    "What the American public doesn't know is what makes them the American public." -Ray Zalinsky (Tommy Boy)
  36. Khm... by zrbyte · · Score: 2, Funny

    "break chemical bonds or ionize electrons"

    Don't know about breaking apart DNA, but I'm pretty sure they can't ionize electrons.

  37. Re:EM radation affects matter? What?! by Anonymous Coward · · Score: 0

    What illiterate i***t tagged this as being offtopic? "Terahertz waves" = Electromagnetic (EM) radiation. The microwave debate goes hand-in-hand with this. It's the single best example, known to everyone, of how EM has an effect on matter, and how there are obvious dangers associated with EM that need to studied rather than ignored.

  38. All your mutants are belong to us --DON'T PANIC! by cosmicaug · · Score: 4, Insightful

    Wait a moment, folk! We are talking about temporary separation of already uncoiled DNA (meaning, that it's probably under the process of being expressed, anyway) under very specific conditions as predicted by a computer model.

    This is not even an empirical observation: we don't know that any of this happens in a cell free in vitro system and how significant the effect is (if any), we don't know if it happens in a cell culture in vitro system and how significant the effect is (if any) and we certainly don't know that anything like this happens in vivo.

    Even assuming that you can create these precise conditions by an airport scanner (which seems rather doubtful), you certainly would not, in any way, be facilitating mutation in any appreciable sense*. All that you would be doing, theoretically, is to subtly alter patterns of gene expression for the few seconds it would take to walk through the scanner (basically, a very subtle regulatory effect). While you certainly can facilitate the development of cancer through such a mechanism (in fact, I'd argue that dysregulation of gene expression** at some points is simply required for carcinogenesis --yes, it can be caused by mutating proteins but these mutated proteins are almost invariably going to have direct or indirect regulatory functions***), such a dysregulation of gene expression would have be the prolonged, normal state of affairs of a cell for a cancer to actually happen. For this to be happening (in a worse case scenario) for as much as a few mere seconds can hardly even be called a dysregulation in any meaningful sense and much, much less have any effect, whatsoever, on carcinogenesis.

    If, on the other hand, some government agency is monitoring you 24/7 with these scanners, then you might have reason to worry****.

    * I would speculate that there's an infinitesimal chance that DNA might be more susceptible to mutations from not being as protected as it would be when paired but you have to realize that active regions of DNA get unzipped like this all the time so this effect, if it might be real, would be a drop in the bucket and utterly swamped by the background.
    ** For purposes of this discussion, what I mean by dysregulation of gene expression is the production of various protein products at inappropriate times or in the wrong amounts (either too much or too little of a protein).
    *** Whether the function is to induce cell division or stop cell division, or to induce cell death (apoptosis) or to evade cell death (and whether it is a direct or indirect effect on the preceding --such as mechanisms sensing DNA damage, loss of contact inhibition, etc.). While other factors which may not always be strictly regulatory do exist such as invasiveness, angiogenesis, telomerase function, etc (which often will also be regulatory by involving over or under expression); these factors need to happen together with a regulatory dysfunction for an actual cancer to happen because, basically, cancer happens when a lot of different sorts of things get screwed up at the same time.
    **** About adjusting your medication dose, that is.

  39. Re:EM radation affects matter? What?! by cosmicaug · · Score: 1

    What illiterate i***t tagged this as being offtopic? "Terahertz waves" = Electromagnetic (EM) radiation. The microwave debate goes hand-in-hand with this. It's the single best example, known to everyone, of how EM has an effect on matter, and how there are obvious dangers associated with EM that need to studied rather than ignored.

    I have no idea who tagged what but see my post above. This study is not so obviously linked to the "microwave debate" and, in fact, implies no "obvious dangers".

  40. Re:Zero-tolerance? Really? by mea37 · · Score: 1

    GP is wrong (or at least, over-generalizing); but to be fair, I don't think you understood him.

    He said "from a CW machine"; he must mean continuous wave. In other words, if you're being hit for a period of time with a wave of a single frequency, then it's possible that resonant effects at that frequency will be harmful even if the wave is very low-amplitude.

    This is why marching formations break step on bridges.

  41. Mutant sing-along by SEWilco · · Score: 1
    All mutants sing along...

    Tiny bubbles [tiny bubbles] Make me warm all over With a feeling that I'm gonna Love you till the end of time

  42. Re:In most cases, airport scanners are still optio by siriuskase · · Score: 1

    I'm surprised that more people don't use general aviation. It seems to be the best loop hole in the TSA system. You don't have to own the plane or have a license. Planes can be rented and friends/family can be pilots. Anyone smart enough to be on slashdot should be smart enough to pass the test or know someone.

    --
    If you must moderate, please moderate as irrelevent, not something bad, because I'm sure someone will find this interest
  43. NOT BEING CRYOGENICALLY FROZEN TEARS APART DNA!!!! by cosmicaug · · Score: 1

    I'd also like to point out that the title of the post is sensationalistic and very highly misleading. Reading such a post, I would surmise that I'm about to read an article regarding the breaking of DNA strands which, though we have repair mechanisms to deal with such eventualities (which can have some curious effects in some non coding regions of our DNA, by the way), is a rather serious effect. I would not suspect from such a title that the article is talking about temporary strand separation of small stretches of DNA. You might just as well write the headline How not being cryogenically frozen tears apart DNA!!!!! because, as long as you have DNA replication, and RNA transcription (to express protein and for other functions) occurring, you are "tearing apart DNA" in the sense of this article.

  44. Sensationalism by Anonymous Coward · · Score: 0

    After reading the original work and several of the references contained within, I am not convinced of the validity of the results. The real problem here is that the model used in this research is based on an overly simplified model (Peyrard-Bishop-Dauxois) for double-stranded DNA. There are many gross approximations in this model, with a few being: only hydrogen-bonds are accounted for between base pairs using a simple one-dimensional potential energy surface, there are no explicit base-pair stacking interactions in the model at all, and more problematic...there is NO solvent (water) in the model. There is no way this model can be numerically accurate enough to warrant any concern about the use of THz radiation. At best, this study will spur other researchers to use more sophisticated models to investigate the interaction of THz radiation and DNA.

    1. Re:Sensationalism by cosmicaug · · Score: 1

      The cell phone causes cancer freaks are going to making a big deal about this (absofuckinglutely guaranteed!) and the model doesn't include solvent or base stacking interactions! LOL!

  45. Reminds me of by jeddak · · Score: 1

    ...this science show I watched recently....

    http://www.bbc.co.uk/doctorwho/episodes/2007/306.shtml

  46. subject by WiFiBro · · Score: 1

    Huray!
    If people won't limit their flying for the climate, then let them do it for their DNA!

  47. Superman by kiehlster · · Score: 1

    So can Superman see X-rays or Tera-waves? or both? He could see through walls, but couldn't see through certain heavy metals like lead. Are X-rays known to pass through bricks as easily as Terahertz radiation? My guess would be that his eyes would have to emit X-rays in order to see through things that way, but perhaps he could use freely available terahertz radiation to naturally see through the same materials. However, he could shoot beams of intense red light (the better to melt things) from his eyes which would suggest he could emit nanometer wavelengths from his eyes, so perhaps 1-100nm x-rays aren't as hard for his eyes to adjust to. Now, if he had the ability to emit terahertz radiation, then it would make him all the more dangerous to mess with. Mess with superman and he'll split your DNA.

    1. Re:Superman by pwfffff · · Score: 1

      "Mess with superman and he'll split your DNA."

      This makes me wonder... could this ever be weaponized? Slap a terahertz radiation gun set to the right resonant frequency into a fake video camera, show up at a press conference for an hour or two, and then three months later whoever you pointed it at inexplicably discovers that they now have four brain tumors...

      Does the secret service scan for stuff like this? If not, it's probably a good idea.

  48. Re:In most cases, airport scanners are still optio by ColdWetDog · · Score: 1

    Right. New York to LA is just fun in a Cessna 172. You realize those things don't have bathrooms?

    --
    Faster! Faster! Faster would be better!
  49. Sunlight by Anonymous Coward · · Score: 0

    Doesn't sunlight contain this radiation as well? I'd assume so since the sun emits radiation over a wide range of wavelengths and this is close to infrared. So what level is in sunlight?

    1. Re:Sunlight by Mitchell314 · · Score: 2, Funny

      But that's radiation from a natural source. Natural photons are much safer that artificial photons.

      --
      I read TFA and all I got was this lousy cookie
    2. Re:Sunlight by ars · · Score: 1

      The transmittance in air is pretty low at this frequency.

      --
      -Ariel
  50. what have we done by thehostiles · · Score: 1

    oh god, somehow we got all the cell phone health nuts and the privacy rights nuts (not quite as crazy) both arguing at the same time... what has science done?

  51. Genetically Modified Citizens Are Loyal Citizens.. by Xin+Jing · · Score: 1

    While they are busy going about their business of damaging our DNA, why not target specific DNA bases? In one fell swoop the government can defend the state against enemies foreign and domestic, and at the same time ensure that future generations of taxpayers and residents comply with government standards of genetic expression and behavior.

    How long will it take before a specific ethnic group claims that their DNA is bombarded with higher doses of more damaging radiation?

    On the upside, the tin-foil hat brigade may finally have cause to bring to market a line of clothing and accessories that seeks to protect people from the prying eyes of their government.

    "Travel wear in this modern age of government suspicion and distrust contains the latest advancements in anti-invasive technology."

    It could present some interesting cross-marketing opportunities, say a remake of Rage Against the Machine's "Killing [DNA] In The Name Of".

    Uncle Sam can modify our DNA, take our genetic rights away and bombard our genes with harmful radiation. Generations from now when humans have been turned into the perfect willing slaves, they will still find a way to resist opression - it's the human way.

  52. "Terror Hurts, by circletimessquare · · Score: 2, Funny

    So We Use Terahertz"

    i'm sorry, but for the sake of just beautifully rhyming government supported advertising jingles, we just can't stop using these waves

    --
    intellectual property law is philosophically incoherent. it is your moral duty to ignore it or sabotage it
    1. Re:"Terror Hurts, by Anonymous Coward · · Score: 0

      Hey! Do you like belt buckles? so where do you mainly buy them? In my opinion it's better to buy these online rather than in intities stores cause online shopping saves your time and money, and, you can get variety of collections to choose from just by clicking on your screen. Most of all, it's very convenient to compare the prices. You'll save a lot so long as you choose the right website to purchase!
       
      We know what our customers think about, so dare to say Besstar.Com will quickly become one of your favorite spot to shop as our prices and our quality will not be beat. Come to visit www.Besstar.com, you always have a section for!
       
      Contact us: sales@besstar.com


        MU I Love MJ Belt Buckle $8.00

      Skull with Rose Belt Buckle $7.20

        School Bus Belt Buckle $7.20


      3D Glisten Star White Belt Buckle $7.20

        3D Bright Gold Belt Buckle $15.00

        SK Crystal Bluck Belt Buckle $11.00


        American Girl Belt Buckle $7.20

        Choppers Belt Buckle $7.20

        SK Cross Belt Buckle $7.20

  53. I love it.... by Anonymous Coward · · Score: 0

    Terahertz radiation is harmless, but a 1.8GHz cell phone causes brain cancer...

    Idiots...

  54. It's called a "false dilemma" by sean.peters · · Score: 1

    Yes, lets give up on airport security. That will end well.

    So if I understand you correctly, "replacing devices that may dangerously irradiate passengers" == "giving up on airport security"? Good to know.

    Yes, I understand and am onboard with the idea that there's probably no real harm being done with the devices in use here. But the point is that we shouldn't assume they're not harmful until it's proven that they are - we should assume that they may be harmful unless it's been shown that they're not. It doesn't sound to me as if sufficient testing has been done.

    As a side point, we should also admit that much of the what goes on in the name of airport security is no more than "security theater" - inconveniencing passengers by forcing them through a bunch of procedures that do little or nothing to actually improve security, but make it look like you're "doing something". I'm not sure if that's the case with the machines we're talking about here, but certainly some aspects of the screening process are a total waste of time - for example, limiting quantities of shampoo brought onboard, for example.

    1. Re:It's called a "false dilemma" by Jah-Wren+Ryel · · Score: 2, Insightful

      As long as they don't subject all airport service personnel, like baggage handlers, to the same level of screening, then these games will provide no significant improvement in security.

      --
      When information is power, privacy is freedom.
  55. Presidential Detection of Emissions... by Xin+Jing · · Score: 1

    I'm sure the Secret Service has a sphere of detection around the the President, that monitors various kinds of emissions.

    I'll leave the specifics of that up to your personal interpretation and research.

  56. Re:EM radation affects matter? What?! by MightyYar · · Score: 1

    how there are obvious dangers associated with EM

    No one is talking about sending 600 watts of continuous EM waves at airline passengers. My grandfather used to heat up hot dogs in front of the radar dish of his ship during WW2... microwave ovens aren't news for the even remotely educated, and the effect of high-powered EM waves are not being debated. Regular old sunlight is EM, and that makes you hot as well. Put your hand too close to a lightbulb and you'll get a nice burn from all of that "dangerous" EM.

    --
    W..w..W - Willy Waterloo washes Warren Wiggins who is washing Waldo Woo.
  57. Re:In most cases, airport scanners are still optio by NormalVisual · · Score: 1

    Planes can be rented and friends/family can be pilots

    Most definitely, and it usually makes for a much more pleasurable flight. It's usually far from cost-effective though. You have to rent the aircraft, pay for fuel, and then you might also be paying landing/parking fees on top of that if you're going to be staying overnight. Just going for the proverbial "$100 cheeseburger" at an airport an hour away actually costs closer to $300 nowadays. This is on top of your private ticket, which you'll probably spend upwards of $10,000 to get, including ground school, aircraft rental, etc.

    GA is a wonderful alternative to commercial flights, but well out of the financial reach of most people, even when you have 2-4 people sharing the costs.

    --
    Please stand clear of the doors, por favor mantenganse alejado de las puertas
  58. Sterilize Your Nation? by handy_vandal · · Score: 1

    Finally, the technology to sterilize an entire continent full of people: space-based terahertz beam satellites. Without destroying buildings and other valuable stuff!

    --
    -kgj
  59. Goodbye TSA, Hello X-Men! by fortapocalypse · · Score: 1

    This scan brought to you by Stan Lee

  60. I guess it's time... by Anonymous Coward · · Score: 0

    to start wrapping my gonads in tinfoil...

  61. Related News by digitalPhant0m · · Score: 0

    With terahertz scanners already appearing in airports and hospitals...

    In other related news, several major airlines are installing extra arm-rests on every seat, for that added bit of comfort for your new mutant arm.

    1. Re:Related News by Dunbal · · Score: 1

      In other related news, several major airlines are installing extra arm-rests on every seat, for that added bit of comfort for your new mutant arm.

            Lies. Only in first class. For the rest of us, airlines are considering charging extra for passengers with 3rd arms...

      --
      Seven puppies were harmed during the making of this post.
  62. FREEDOM ISN'T FREE!!!!!1!!1!oneone by Benfea · · Score: 1

    Freedom isn't free, you damned America-hating, terrorist-loving hippie! If you don't like it, GET OUT OF MY COUNTRY! [/conservolibertarian]

  63. Why are they being used in public? by Anonymous Coward · · Score: 0

    Why are these things being used in public if they haven't been tested?

  64. Tera-hertz radiation by Anonymous Coward · · Score: 0

    Not that a name proves anything, but in this particular case it really does not help either with the case for a non-harmful EM radiation.

    http://en.wikipedia.org/wiki/Teratology#Teratogenic_agents
    http://www.wordinfo.info/words/index/info/view_unit/2114

  65. I Implemented A Terahertz Scanner by Anonymous Coward · · Score: 0

    Hi,

    I was hired by a PhD in physics to implement a Terahertz radiation scanning system for use in an industrial site. I don't believe the claims of the article (which may or may not reflect the study). For one thing, Terahertz radiation is not nearly as useful in medicine as the article makes it out to be. The reason being that Terahertz radiation cannot penetrate WATER. While my job was mainly to implement the software routines that guided data acquisition, I spent a lot of quality time with our Terahertz radiation machine. Terahertz radiation cannot penetrate the human body, which can be proven by placing one's hand between the device's emitter and detector. The detector will receive zero information from the emitter (both the detector and emitter operate at an extremely low power, btw).

    I know this because the water problem was a major theoretical problem for our group. Many of the experiments consisted of material samples that were wet to some degree. It was eventually decided that while some water was OK, the amount in the sample had to be quite small. Orders of magnitude smaller than the amount of water in your hand for example.

    My supervisor has been researching terahertz radiation for the past ten years. He says that researchers expecting to use terahertz radiation in the field of medicine are barking up the wrong tree. He also says that Terahertz radiation is safe. I guess if I get skin cancer on my hand, he was wrong. But I doubt that will happen.

    1. Re:I Implemented A Terahertz Scanner by ars · · Score: 1

      So, if I want to conceal something from the scan, just fly on a rainy day and get soaking wet?

      --
      -Ariel
    2. Re:I Implemented A Terahertz Scanner by Anonymous Coward · · Score: 0

      So, if I want to conceal something from the scan, just fly on a rainy day and get soaking wet?

      Yeah, that would likely defeat the scanner. But then they'd pat you down for being suspiciously damp.

  66. Re:there was a little old lady in the UK who turne by coolsnowmen · · Score: 1

    True, but TSA doesn't give a damn if you are a spy, only if you are packing heat, or too much shampoo.

  67. EH... by Anonymous Coward · · Score: 0

    you're just another idiot trying to knock liberty. It's not ivory tower dwelling libertarians developing this zapping shit.
    Regardless, this has to be STOPPED.

  68. Safe exposure? by prometx42 · · Score: 2

    How about no exposure?

  69. Re:EM radation affects matter? What?! by Anonymous Coward · · Score: 0

    right, we know that it takes a lot of power to generate _instant_ results, but does that mean that low effect over time = no result at all? how do you know this? where did you conjure this knowledge from? how do you know this even applies to the "known" part of the em spectrum like the ghz range?

    your naiveness is striking.

  70. Impact on Pseudosciences by rwa2 · · Score: 1

    Hmm, I do find this interesting... perhaps this kind of effect can be how some saunas attribute "health benefits" to the "natural oscillations" emitted by rooms covered in different colored rocks?

    I pretty much dismissed it before, but it's interesting if there might be some way for your environment to affect those kinds of operations inside of your cells.

  71. Sound like it would be good for cancer treatment. by John+Sokol · · Score: 2, Interesting

    It sounds like this is probably far safer and more controllable then X-Rays or Gamma Rays for the treatment of Cancer.

    A big part of the idea with radiation treatments for cancer is to break the DNA of the cells such that they do not die instantly leaving a big hole, but instead are just prevented from successful reproduction. So as these cancer cells try to reproduce they die off instead. This happens slowly over time so that normal cells from healthy surrounding tissue can migrate over and fill in the treated cells as they die off.

    These THz waves could target just the DNA, killing those cells in a region and unlike X-Rays may have a lower chance of creating a new cancer from the radiation itself or damaging surrounding tissues.

    --
    I am always doing that which I can not do, in order that I may learn how to do it. - Pablo Picasso
  72. Re:NOT BEING CRYOGENICALLY FROZEN TEARS APART DNA! by Dunbal · · Score: 2, Informative

    As a physician, I agree with you. Even sunlight can disrupt some of the bonds in your skin's DNA. And unless you are genetically susceptible due to lack of an enzyme (eg xeroderma pigmentosum , you should be fine if you lead a normal life. However there is a positive correlation between excessive sunlight exposure (and thus DNA damage), pale skin, and skin cancer. No biological system is perfect - that's why disease and aging exist. So if you play roulette with your enzymes, you will eventually cause a problem that they won't be able to fix, and end up with disease. The "repair mechanisms" are NOT flawless or foolproof. That's also why we have genetic mutation and evolution. Not being "foolproof" has a plus side, too. But if you end up with melanoma, you won't be too happy.

          Now with a new technology it's hard to put the brakes on and say "stop! we need 20 years of testing!". Even regular ultrasound machines - which operate in the MHz range - have not been tested conclusively. We assume that they're safe, in theory. Often the benefits of using them FAR outweigh the risk - especially since they've been around for a while and no cases of harm have been reported or linked to the machines. But it's logical to try and limit exposure to what's absolutely necessary, so we don't repeat what we were doing with "harmless" x-ray machines and coincidentally were killing all our radiologists with leukemia...

          Unleashing a "scanner" to be used on the general population, without their consent, possibly even covertly, and without any followup or documentation to ensure that there is really zero risk is a large gamble on the part of the government. Only if "frequent travelers" start developing strange tumors at significantly increased statistical rates will we know there's a problem. I'd hate to be one of those travelers, and I'd hate to be the owner of the company that makes these machines, if it ever happens. I hope it doesn't, but we simply don't know.

    --
    Seven puppies were harmed during the making of this post.
  73. Yeah... So here's how I think it will REALLY go... by Fantastic+Lad · · Score: 0, Troll

    After some initial buzz, this theory will be found highly debatable, the DNA damaged in some tests will be discovered to have been the result of poor testing, the damage will be considered within the normal range of every day life beneath a solar object like our Sun, and generally the whole issue will be relegated to the FUD desk and there forgotten except by the reactionary fringe which seems incapable of doing its homework.

    All while the real issue remains tidily ignored. And why? Because wave forms are the key to everything, so the black hats are going to do their utmost to retain control over the control, as it were.

    (Side note; I recently worked out how those giant megalithic blocks of stone might have been moved using, as is claimed, simply sound. It's so blindingly obvious that I actually smacked my forehead when I realized the basic principal behind it. --You know how when your cell phone is set to 'vibrate' rather than ring, and it sort of slides across the table? Same thing. Just broadcast a sound on the same resonant frequency as the big object you want to move, set it vibrating and then just push. Big blocks of stone remain heavy, but I imagine once you remove friction from the equation, building one of the thousands of megaliths dotting the planet becomes a somewhat more reasonable task.)

    Anyway, the real issue, in case anybody cares, has little to do with the high frequency carrier signal itself in a cell phone handset, (other than that it makes the whole game possible), but rather the modulated frequencies in the 10Hz to around 500Hz range where cells start doing peculiar things when exposed. --Odd things like opening and closing cell-wall permeability to particles in the blood, (this is of particular moment with regard to the Blood Brain Barrier). Keeping in mind that this occurs well below the power levels at which ionization is observed.

    But so what? Cell phones move data in the kilobytes per second range, well above the 10 - 500 Hz where cells start doing the funky chicken when excited. Thing is, and here's the rub, with every model of cell phone right from their introduction onto the market, the technology has found some fundamental excuse for broadcasting modulated pulses within that exact range. For example, GSM phones use a system called, Time Division Multiple Access or TDMA for short.

    It is described thusly. . .

    To increase the number of users that can communicate with a base station at the same time, a technique called Time Division Multiple Access (TDMA) is employed that allows each channel to be used by eight phones. This is achieved by compressing each 4.6 ms chunk of information to be transmitted into a burst or pulse 0.58 ms long (1 ms or millisecond is a thousandth of a second). So the phones and base stations transmit for 0.58 ms, every 4.6 ms, which results in a 217 Hz pulse modulation* or variation in their output (217 Hz = 1/4.6 ms). For technical reasons, there is, in fact, additional data compression which leads to the phones and base stations transmitting 25 pulses but omitting every 26th , and so on. This produces further pulse modulation of the power output at the lower frequency of 8.34 Hz (= 217 Hz/26).

    Page 31 section 4.13 - Independent Expert Group on Mobile Phones

    This puts the common GSM cell phone directly in the 10 - 500 Hz range with several regular signals which nerve cells, and brain cells specifically respond to. Each of the other cell phone systems finds a similar excuse to pulse in this range.

    And, I suspect, the same will be true of the newer systems, but as per usual, this will not be explored in favor of alarmist and for the most part, (as far as I have been able to determine after reading this stuff for years), misleading stories about cancer. --While it is probably not a good idea for one's blood brain barrier to open up when toxins are coursing through the blood, I

  74. Re:EM radation affects matter? What?! by MightyYar · · Score: 1

    your naiveness is striking.

    And what exactly is your educational background? I'm not going to pretend to be anything but a mechanical engineer, but your post seems to indicate a weak science background.

    But to answer your question:

    but does that mean that low effect over time = no result at all?

    Your microwave cooks food by pumping in hundreds of watts worth of photons which are absorbed by the food. The food cannot emit the same number of photons at the same pace, so it heats up. Proteins and other materials change when heated beyond a certain temperature... and so you have cooked food. If you pump in fewer photons... like say a few miliwatts, the food is able to emit that and doesn't heat up... so no, you won't have the same effect.

    Why, how do you think a microwave works? And how does this apply to very small wattages?

    --
    W..w..W - Willy Waterloo washes Warren Wiggins who is washing Waldo Woo.
  75. crazy thing called freedom by Plugh · · Score: 1

    I got a crazy idea.
    What if the government WASN'T in control of security at airports, and indeed, was no more in control of air travel than it is of, say, skateboard travel?

    What if different airlines and airports could compete on the basis of various kinds of safety measures, price, speed thru the process, and so forth?

    In short, what if we had the amazing diversity that results from a FREE MARKET, with millions of people making individual choices, rather than a one-size-fits-all centrally-planned government-run society?

    Yeah, I know. Crazy talk.

    1. Re:crazy thing called freedom by mr_java66 · · Score: 0

      The problem with the idea that you endorse is 'negative-external'. Simply put, the people who went to work at the WTS on 9/11 didn't have a choice about airline safety measures but DID have a significant cost. Given the asymmetries in the 'safety-market' I don't see how a free market approach would have sufficient drivers in it to create an acceptable level of confidence for those of us on the ground. On the other-hand, if an airline had to ALWAYS pay for every cent of damage its equipment did, well then I could see how this could sort of work.

    2. Re:crazy thing called freedom by Plugh · · Score: 1

      > the people who went to work at the WTS on 9/11 didn't have a choice about airline safety measures

      Yes they did. As an employee, where I choose to work is just that: *my* choice.

      The most dangerous jobs in the world include fishing and farming. Does a fisherman have "no choice" about having a dangerous job? Does a sensible fisherman not take into account the kind of boat he'll be on, and how safety-conscious the rest of the crew appears to be?

      And yes, I am suggesting that for government to not distort the market for safety, it must also not set distorting maximums on the restitution that must be paid to airlines whose lax standards are found (in private arbitration, of course) to be wholly or partially liable for damages.

      Government does a crappy job providing food and cars. Why would anyone expect it to do better at providing safety or arbitration services?

  76. Re:Sound like it would be good for cancer treatmen by BitZtream · · Score: 1

    You realize that if you kill cancer cells they don't go away right? They don't magically disappear. They are handled just like any other dead cells in your body, which are rather common.

    --
    Persistent Volume manager for Kubernetes - https://github.com/dwimsey/openshift-pvmanager
  77. Re:Yeah... So here's how I think it will REALLY go by Fantastic+Lad · · Score: 1

    Troll? Really?

    Did the moderator even read past the first sentence? I doubt it. Whenever it's my turn to moderate, I want to offer the assurance that I read every word in a given post and think carefully before assigning a moderation. I distribute points very fairly; I regularly mod posts 'interesting' even when I happen to totally disagree with a point of view but think the comment nonetheless adds new ideas to a discussion. Interesting and Incorrect are not mutually exclusive. A little care then, please.

    -FL

  78. Re:EM radation affects matter? What?! by Anonymous Coward · · Score: 0

    A microwave pumps photons?

    Bullshit.

    It emits, surprise surprise, RF microwave EM radiation, which vibrates the water molecules in the substance to be heated.

    Even for Slashdolt that displays extraordinary ignorance!

  79. Re:EM radation affects matter? What?! by MightyYar · · Score: 1

    LOL. I'm being lectured by someone who doesn't know that microwaves are photons.

    --
    W..w..W - Willy Waterloo washes Warren Wiggins who is washing Waldo Woo.