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New Nanoparticle Sunblock Is Stronger and Safer, Scientists Say

Posted by samzenpus on from the permanent-shade dept.

sciencehabit writes: What's the best sunscreen? It's a question that troubles beachgoers, athletes, and scientists alike. Mark Saltzman, who falls into the last category, was so concerned by the time his third child was born that he wanted to engineer a better sunblock. "The initial goal was to make a sunblock that lasted longer," says Saltzman, a biomedical engineer at Yale University. "But as I read more about sunscreen, I became aware of people's concerns about safety." Now, he and his colleagues have unveiled the results of their research: a nanoparticle-based sunblock, which they say is longer lasting and less likely to leak into the body than traditional sunscreen.

114 comments

  1. First sunbeam by SomeoneFromBelgium · · Score: 2

    ... or not (blocked)

  2. Nano Zinc Oxide is not new by YesIAmAScript · · Score: 4, Interesting

    It's been around for a while. It has the block power of zinc oxide without being white.

    http://ec.europa.eu/health/sci...

    This article is not clear about which nanoparticles they are using, but we already have effective sunblocks using nanoparticles.

    --
    http://lkml.org/lkml/2005/8/20/95
    1. Re:Nano Zinc Oxide is not new by Anonymous Coward · · Score: 0

      Nano Zinc Oxide is considered dangerous. Something about it being absorbed into the body.
      Most self-respecting (safe and/or marked as "for children") sunscreens use non-nano zinc oxide. Read the label.

    2. Re:Nano Zinc Oxide is not new by Anonymous Coward · · Score: 1

      Yeah, the important point seemed to be the bio-adhesive properties of these particular nano-particles, not the fact that they are nano-particles. As usual, the actual news bit was missing from the slashdot summary. The article is talking about encapsulating a UV blocker (Padimate O in this case) inside bioadhesive nanoparticles. The bioadhesive properties of the nanoparticles and the encapsulation of the UV blocking molecules serves to limit unwanted absorbtion of the compounds, and keep them on the surface of the skin, where the UV filter is most effective, if I skimmed it right.

    3. Re:Nano Zinc Oxide is not new by Anonymous Coward · · Score: 0

      They don't use zinc oxide, they use Padimate O. It's an organic UV filter which has apparently been incorporated into many other commercially available suncreens as well, and works well but has unknown and potentially serious side-effects. Applying the Padimate O in nano form has allowed them to use much less of it, but another crucial aspect of the paper is that they gave the nanoparticles adhesive properties by adding aldehydes. IMHO reading all of this has made me realize how much safer it is to use clothes- I do not want to be smearing myself with nanoparticles with aldehyde groups surrounding an organic compound that may have endocrine disrupting properties!
      The actual article spells this out very nicely in the introduction, and is actually free to view. It's unfortunate most people will read a bad slashdot summary which links to another summary article, when the original nature article is actually being provided free to read- we all got so used to articles not being accessible that now that they sometimes are no one reads them anyway. And really, the authors did a nice job of writing an understandable introduction.

    4. Re:Nano Zinc Oxide is not new by Anonymous Coward · · Score: 0

      I live in the worst desert on the planet and use sunscreen with titanium nano particles. This isn't new at all, but no matter what you do, sunscreen will make you look shiny and white, since the whole purpose of the sunscreen is to reflect the sunlight.

    5. Re:Nano Zinc Oxide is not new by Mr+D+from+63 · · Score: 1

      Why would something that clings to the body be safer than something that passes through it? Assumptions one way or the other are just that.

    6. Re:Nano Zinc Oxide is not new by Kkloe · · Score: 2

      because it "passes" * cough * through alot of vital organs and instead of passing through it gets concentrated up to toxic levels or react with other things inside the body?

    7. Re:Nano Zinc Oxide is not new by Anonymous Coward · · Score: 0

      "...has unknown and potentially serious side-effects."

      So you know it *has* side effects.
      But they are both *unknown* and 'potentially serious'.

      Seriously? You make a claim, and provide the statement that disproves it *in the same sentence*? In adjacent words even!

    8. Re:Nano Zinc Oxide is not new by sexconker · · Score: 3, Funny

      I live in the worst desert on the planet

      Say hello to the penguins for me!

    9. Re: Nano Zinc Oxide is not new by Anonymous Coward · · Score: 0

      You mean African penguins, right?

  3. "longer lasting and less likely to leak" by Anonymous Coward · · Score: 0

    Can they make me a new penis out of this nano stuff?

    1. Re:"longer lasting and less likely to leak" by Anonymous Coward · · Score: 0

      Can they make me a new penis out of this nano stuff?

      You already have a nano penis

    2. Re:"longer lasting and less likely to leak" by Anonymous Coward · · Score: 0

      He wants a bigger one.

  4. What's wrong with titanium dioxide? by Ihlosi · · Score: 4, Insightful

    What's wrong with titanium dioxide again?

    1. Re:What's wrong with titanium dioxide? by WarJolt · · Score: 1

      I think as long as you don't eat it you should be fine.

    2. Re:What's wrong with titanium dioxide? by Anonymous Coward · · Score: 2, Informative

      Except it is used as white food coloring. https://en.wikipedia.org/wiki/Titanium_dioxide

    3. Re:What's wrong with titanium dioxide? by Anonymous Coward · · Score: 1

      TiO2 is in plenty of foods.

    4. Re:What's wrong with titanium dioxide? by davester666 · · Score: 1

      Then why to they make it in paste form?

      --
      Sleep your way to a whiter smile...date a dentist!
    5. Re:What's wrong with titanium dioxide? by Misagon · · Score: 4, Interesting

      Titanium Dioxide is a common additive as white colouring in foodstuffs such as cookies and candy. For instance, it is sometimes used to make sugar glazing on German lebkuchen cookies whiter.
      In Europe it is often in ingredients lists under the number E-171 rather than its full name.

      Titanium Dioxide is one of the pigments that are suspected of leaking into the body, both from food and from its use in sunscreen.
      Therefore, it is something that I look for and avoid.

      --
      "We mustn't be caught by surprise by our own advancing technology" -- Aldous Huxley
    6. Re:What's wrong with titanium dioxide? by Anonymous Coward · · Score: 0

      It's not pretty.

      Seriously,actually.

    7. Re:What's wrong with titanium dioxide? by Anonymous Coward · · Score: 0
      It's not pretty.

      99% of the bodies it is applied to aren't, either. So not much changes.

    8. Re:What's wrong with titanium dioxide? by Attila+the+Bun · · Score: 2

      Nothing, if you don't mind covering yourself in thick white paint. In nano-particle form it is less unsightly, but there are concerns about the health effects of nano-particles. Their small size gives them a high proportion of broken or strained chemical bonds, which can work as a chemical catalyst. There is concern that nano-sized particles could enter cells, and their reactivity could lead to DNA damage. Given the cumulative nature of such damage, and the long time scale for the effects to become apparent, it will be some time before the safety of nano-particles is properly established.

    9. Re:What's wrong with titanium dioxide? by jafiwam · · Score: 1

      It's not pretty.

      Seriously,actually.

      They should put glitter and sparkles in it. That will both prevent use, and encourage use at the same time.

    10. Re:What's wrong with titanium dioxide? by ITRambo · · Score: 1

      Inhalation of dried nano-TiO2 and nano-zinc oxide containing sunscreen apparently causes undesirable effects. Link: http://www.nicnas.gov.au/commu...

    11. Re:What's wrong with titanium dioxide? by Muad'Dave · · Score: 2

      Already exists. My wife bought this by accident and looked fabulous while we were on St. Croix.

      --
      Tiller's Rule: Never use a word in written form that you've only heard and never read. You will end up looking foolish.
    12. Re:What's wrong with titanium dioxide? by Anonymous Coward · · Score: 0

      Yeah, because being white is no longer a good thing.

      Aint that the truth.... :-(

    13. Re:What's wrong with titanium dioxide? by tehcyder · · Score: 0

      If you really don't want the sun on your skin, why not just wear some, you know, clothes?

      --
      To have a right to do a thing is not at all the same as to be right in doing it
    14. Re:What's wrong with titanium dioxide? by Anonymous Coward · · Score: 0

      > Titanium Dioxide is one of the pigments that are suspected of leaking into the body...

      Sure. But, *what's wrong* with Titanium Dioxide?

    15. Re: What's wrong with titanium dioxide? by Anonymous Coward · · Score: 0

      Nellie pics or it didn't happen!

    16. Re:What's wrong with titanium dioxide? by Vitriol+Angst · · Score: 1

      I thought we needed 8 essential minerals + Titanium in our breakfast serials -- has this changed? It's the other white mineral, after all. Like Turkey but without the additives of meat.

      --
      >>"ad space available -- low rates!!!"
    17. Re:What's wrong with titanium dioxide? by Anonymous Coward · · Score: 0

      clothes have spf of about 2. At UV everyone is half naked. If you wash the clothes in nasty detergents containing "optical brightners", which are what make t-shirts glow under uv lamps at halloween, then they will work better as sun protection, but that's a pretty big gap to cover.

    18. Re:What's wrong with titanium dioxide? by nitehawk214 · · Score: 1

      "contain fewer chemicals"

      The only way it can do that is by making the bottle contain less product.

      --
      I'm a good cook. I'm a fantastic eater. - Steven Brust
    19. Re:What's wrong with titanium dioxide? by gstoddart · · Score: 1

      Hmmm ... they make epoxy and etching compound in paste form ... are you suggesting you're a child and will eat all forms of paste?

      Sounds like a self correcting problem.

      --
      Lost at C:>. Found at C.
    20. Re:What's wrong with titanium dioxide? by thegarbz · · Score: 2

      Therefore, it is something that I look for and avoid.

      Lots of things leak into the body. Why is it that specifically this one should be avoided if it's considered safe to eat?

    21. Re: What's wrong with titanium dioxide? by Anonymous Coward · · Score: 0

      Chemical is a word that can be both a counting noun and a mass noun with different meanings. The plural refers to the number of varieties involved. A container of pure water contains fewer chemicals than a mixture of pure water and alcohol, even if both have the same mass or molecule count.

      It is the same as the word fish, where saying fishes refers to multiple varieties. A tank with fewer fishes is different than a tank with fewer fish.

    22. Re:What's wrong with titanium dioxide? by Ihlosi · · Score: 1
      If you really don't want the sun on your skin, why not just wear some, you know, clothes?

      I take it you've never suffered a sunburn bad enough to make your skin peel off, through clothes and while trying to stay in the shade most of the time?

  5. Best sunscreen... by glaciator · · Score: 3, Interesting

    ...is plant fiber, twisted into strings and tightly woven. AKA clothes. White cotton or linen, preferably. Ask the desert people their opinion about nanoparticles.

    1. Re:Best sunscreen... by CastrTroy · · Score: 3, Informative

      Works great at the beach.

      --

      Anthropic principle: We see the universe the way it is because if it were different we would not be here to see it.
    2. Re:Best sunscreen... by roger10-4 · · Score: 1

      Not sure if that was sarcastic, but OP is correct (with the addition of synthetic materials). I live by the ocean where the UV index is almost always extreme. Rash guards/wetsuits can cover most of your body and really are the best way to protect against the sun if you spend any amount of time in the water. It doesn't wash off and you don't miss spots (it's also it's better for the environment for those that care about it).

    3. Re:Best sunscreen... by Wycliffe · · Score: 1

      Not sure if that was sarcastic, but OP is correct (with the addition of synthetic materials). I live by the ocean where the UV index is almost always extreme. Rash guards/wetsuits can cover most of your body and really are the best way to protect against the sun if you spend any amount of time in the water. It doesn't wash off and you don't miss spots (it's also it's better for the environment for those that care about it).

      The first places to burn on me are my nose, cheeks, ears, and back of the neck, in that order. The stuff typically covered by clothes are usually just fine.
      A wide brim hat might help a little but really doesn't work well when you are swimming. I hate sunscreen especially on the face but clothing really doesn't
      work well on the face. I'm pretty sure everyone hates sunscreen and we really need to come up with a better solution.
      My suggestions to get us started are:
            1) an umbrella drone that follows you around while you are swimming.
            2) release a ton of particle into the atmosphere that selectively block UV.
            3) some sort of full body lightweight bodysuit that covers the head and lets water in/out but blocks UV.

    4. Re:Best sunscreen... by trawg · · Score: 1

      Not sure if that was sarcastic, but OP is correct (with the addition of synthetic materials). I live by the ocean where the UV index is almost always extreme. Rash guards/wetsuits can cover most of your body and really are the best way to protect against the sun if you spend any amount of time in the water. It doesn't wash off and you don't miss spots (it's also it's better for the environment for those that care about it).

      Rashies are very common in Australia at the beach (I wear one any time I go into water at all because it's so much easier than sunscreening my body).

      For summer sports though they're not really an option. Cricket is manageable; you can wear long sleeves and pants and hats and be covered. But for more active sports (e.g., I play soccer) wearing long clothes is very uncomfortable.

      I've been in the US for most of summer and play soccer several times a week during the day so have become more familiar with local sunscreen options. Almost looking forward to winter where I /have/ to wear long clothes. Back home I try to play soccer at night!

    5. Re:Best sunscreen... by sexconker · · Score: 1

      You are asking for a hat.
      Alternatively, longer hair and a light beard will cover every one of your problem areas but your nose.

    6. Re:Best sunscreen... by Nexus7 · · Score: 1

      Cotton is unsuited for sports. Consider technical clothing, for example, this one with UPF 50. https://www.thenorthface.com/s...

    7. Re:Best sunscreen... by Anonymous Coward · · Score: 0

      Ask them their opinion of women too while you're out there.

    8. Re:Best sunscreen... by thegarbz · · Score: 2

      Of course OP is correct. But the whole purpose of sunscreen is that we don't need to wear cloths. Bikinis have been getting smaller for decades, let's not undo all that good work out of fear of a bit of sunlight.

      Me, I wear a rashie, but I do it for protection, ... other people's protection ... me without a shirt on is cruel and unusual punishment. December 31st is coming though so maybe I'll set a goal to have abs next year ... again.

    9. Re:Best sunscreen... by MBGMorden · · Score: 1

      OR . . . . I can just wipe on some inexpensive lotion for the times when I'm in the sun rather than put up with uncomfortable lengths of hair all the time.

      --
      "People who think they know everything are very annoying to those of us who do."-Mark Twain
    10. Re:Best sunscreen... by godel_56 · · Score: 1

      The first places to burn on me are my nose, cheeks, ears, and back of the neck, in that order. The stuff typically covered by clothes are usually just fine. A wide brim hat might help a little but really doesn't work well when you are swimming. I hate sunscreen especially on the face but clothing really doesn't work well on the face.

      Australian scientists have tested wide brim hats and they give an effective sun protection factor of about 5. The fabric itself has an SPF in the hundreds but reflections off glass and pavements and atmospheric refraction of UV, plus the user looking up and around from time to time give added exposure to the face and neck.

  6. Stay out of the sun, or wear clothing by cerberusss · · Score: 2

    FTFA:

    Mark Saltzman, who falls into the last category, was so concerned by the time his third child was born that he wanted to engineer a better sunblock.

    Little children don't belong in the sun, in my opinion. I dress my two year old such that only her face, hands and feet are exposed by clothing. Every hour or so, I apply sunscreen. During summer, we'll be outside of course but if possible in some sort of shaded place. I've seen small children burned red by the sun, and I'm amazed at the carelessness. Better your child is hot than burned, right?

    That was my pet peeve. Besides that, I applaud this research.

    --
    8 of 13 people found this answer helpful. Did you?
    1. Re:Stay out of the sun, or wear clothing by Anonymous Coward · · Score: 4, Insightful

      "Little children don't belong in the sun" is just the other side of the "let your kid burn" coin. Both are extremes, and you'd probably be doing your kid better by chilling out a bit. You are likely contributing to chemical imbalances, depression, and/or vitamin D deficiency. You could be making your kid unnaturally paranoid about minor dangers. You could be restricting critical outdoor play time. Please don't take this as insulting your parenting, I know you're doing what you feel is best, it's just that this overprotectiveness is happening more and more lately and in many instances leading to worse problems than they aim to solve (while simultaneously requiring ten times the worry and energy from the parents).

      People need sunlight. On our skin, diffused/reflected into our eyes. It's absolutely necessary. Yeah, too much of it is a bad thing, so don't get too much. But too little is also bad.

    2. Re:Stay out of the sun, or wear clothing by swb · · Score: 1

      I think we grew up closer to the "let your kids burn" side of the coin. We would go to the beach at a local lake almost daily when we were between about the ages of 5 and 12 and I think my mom would put whatever passed for "suntan lotion" in the 1970s on us, once, when first got there and never reapply.

      I don't ever remember getting sunburned but I do remember getting a really dark tan.

    3. Re:Stay out of the sun, or wear clothing by Wycliffe · · Score: 1

      I think we grew up closer to the "let your kids burn" side of the coin. We would go to the beach at a local lake almost daily when we were between about the ages of 5 and 12 and I think my mom would put whatever passed for "suntan lotion" in the 1970s on us, once, when first got there and never reapply.

      I don't ever remember getting sunburned but I do remember getting a really dark tan.

      This is the method I still use on my kids. I apply a high SPF sunscreen when we first arrive and never reapply. My kids have NEVER got a sunburn using this method. The only time my kids have every got close to being sunburned is when we forget to put it on at all. If we are somewhere all day for 8+ hours, I do occasionally do a second application at about the 4-6 hour point just as a precaution but even when I don't get around to the second application, my kids have never had a sunburn.

    4. Re:Stay out of the sun, or wear clothing by Anonymous Coward · · Score: 0

      Why even bother going to the beach ? This sounds horrible.

    5. Re:Stay out of the sun, or wear clothing by orasio · · Score: 1

      In any case, sunburn is not the only reason you apply sunblock.

      Skin cancer doesn't really care all that much about sunburn, but the total of hours in the sun divided by the power of the sunblock used.

    6. Re:Stay out of the sun, or wear clothing by swb · · Score: 1

      This is mostly what I end up doing about the second half of the summer.

      We go out to the lake and I apply SPF 55 when we first get there and about the first half of the summer I reapply after about 4 hours. By the end of the summer I still do the initial application but seldom reapply without any issues.

      With me, I probably mitigate this by wearing a loose-fitting "fishing shirt" that has some kind of super high SPF number (it's advertised for its sun safety) and a broad billed hat. I figure the sun exposure I don't get at all is the best protection.

      But I usually spend about half the time at the lake swimming or floating in the water with my shoulders and bald head exposed, although occasionally with a hat.

    7. Re:Stay out of the sun, or wear clothing by tehcyder · · Score: 1
      Who the fuck stays outside in the sun with kids for 8+hours at a time?

      After an hour I'm ready for the bar and a fridge full of cold beers.

      --
      To have a right to do a thing is not at all the same as to be right in doing it
    8. Re:Stay out of the sun, or wear clothing by Wycliffe · · Score: 1

      Who the fuck stays outside in the sun with kids for 8+hours at a time?

      After an hour I'm ready for the bar and a fridge full of cold beers.

      Have you never gone to the lake, gone camping, gone to a fair, gone to disney world, gone to a water park, gone to an amusement park, gone canoeing, gone on a multiday hike, etc.... There are a ton of different all day activities that are spent outside.

    9. Re:Stay out of the sun, or wear clothing by sexconker · · Score: 1

      All of those sound like absolute hell if you've got kids with you.

    10. Re:Stay out of the sun, or wear clothing by aardvarkjoe · · Score: 1

      Better your child is hot than burned, right?

      I'd bet that more people die from heat stroke than from sunburn.

      Just saying...

      --

      How can we continue to believe in a just universe and freedom to eat crackers if we have no ale?
    11. Re:Stay out of the sun, or wear clothing by nitehawk214 · · Score: 1

      Forget about outside. Any amount of time with kids has me ready to drink.

      --
      I'm a good cook. I'm a fantastic eater. - Steven Brust
    12. Re:Stay out of the sun, or wear clothing by thegarbz · · Score: 1

      Don't assume that advice is universal. I live in the skin cancer capital of the world. A trip to the beach will guarantee a sunburn if we're there the entire day, even with liberal re-application.

      Mind you in summer our UV is extreme enough that you get burnt in a cool 8 minutes in the sun. Our growing up campaign was therefore slip, slop, slap. Slip on a shirt, slop on some sunscreen and slap on a hat.

    13. Re:Stay out of the sun, or wear clothing by thegarbz · · Score: 1

      False. The body is far more resistant to continuous sun as it builds up a natural defense against it.
      End result is someone with a natural tan who spends every day in the sun is less likely to be affected than a pale geek who goes out once a week and gets roasted.

    14. Re:Stay out of the sun, or wear clothing by jbengt · · Score: 1

      End result is someone with a natural tan who spends every day in the sun is less likely to be affected than a pale geek who goes out once a week and gets roasted.

      What about a pale geek like me, who can't get much of a tan no matter how much sun I get?

    15. Re:Stay out of the sun, or wear clothing by Anonymous Coward · · Score: 0

      Sounds like a recipe for cancer ... avoiding any exposure to the sun.

    16. Re:Stay out of the sun, or wear clothing by MBGMorden · · Score: 1

      I think my mom would put whatever passed for "suntan lotion" in the 1970s on us, once, when first got there and never reapply.

      Honestly I think the "reapply" part is mostly marketing wanting to sell more sunscreen anyways. I'm your typical sunburn risk patient - blond hair, blue yes, and paper-white skin. I walk out into the sun without sunscreen and I'll burn to a crisp in ~90 minutes. I do a lot of fishing though and am out in the sun a lot. As long as I put on sunscreen in the morning I'm perfectly fine (usually do 50 to 70 SPF). Sometimes I'm on the boat in the sun for 7 or 8 hours with a single application and I'm perfectly fine when I get home.

      Honestly I also don't care too much about brands wither. I think what I've got in the boat now is Banana Boat, but I've gone out plenty of times with store-brand sunscreen and its worked fine.

      --
      "People who think they know everything are very annoying to those of us who do."-Mark Twain
    17. Re: Stay out of the sun, or wear clothing by Anonymous Coward · · Score: 0

      This has pretty much been shown to be false by research, but it depends on the type of cancer (and there are other kinds of skin damage too). Some correlates with sunburns, but a lot goes with just cumulative sin exposure, especially UVA based damage that is not as well blocked by pigments and sunblock.

  7. Safe.. by sTERNKERN · · Score: 1

    As was DDT.. I love when they just make a new material and say it is safe. We'll see.. we'll see.

    1. Re: Safe.. by terjeber · · Score: 0

      For the record, the ban on DDT has killed orders of magnitude more people than DDT ever could. The ban on DDT was FAR worse than DDT.

    2. Re:Safe.. by Anonymous Coward · · Score: 0

      Seriously, what you said. Lack of significant studies does not equal safe. Things prove themselves safe both with many properly performed studies as well as over time as people start using them. Claiming a new substance is safe is about on par with saying you made a computer unhackable.

      And if anyone says "maybe we should be careful before having hundreds of millions of people rubbing this new thing on their skin" the "I fucking love science" crowd jumps all over them, because while they may love science they don't understand a fucking thing about it or what it even is/isn't.

  8. Re:Toxic by Chrisq · · Score: 3, Insightful

    Aren't nanoparticles toxic?

    Absolutely, just like chemicals are ;-)

  9. Reef safe? by Anonymous Coward · · Score: 0

    I would like to know if this stuff is reef safe. Apparently, a lot of conventional sunscreen is toxic to corals, which is (or should be) a concern to scuba divers and snorkellers.

  10. Lab notebook by 6Yankee · · Score: 2

    August 12th: Test Subject 2 appears to have cooked. Another 9-month sabbatical, damn it.

    1. Re:Lab notebook by dotancohen · · Score: 1

      August 12th: Test Subject 2 appears to have cooked. Another 9-month sabbatical, damn it.

      Of course, before the 9-month sabbatical comes a research-grant funded "Create Test Subject 3" night with the undergrad redhead lab assistant.

      --
      It is dangerous to be right when the government is wrong.
  11. 'Nano particles' by GoooF · · Score: 1

    Its great that they have developed a new sunscreen that is more effective.
    The thing I don't like is the 'nano particles' part, where do these nano particles go?
    How do they affect the environment?
    I can imagine that there are quite a lot of sunblock used around the world ...

    1. Re:'Nano particles' by Anonymous Coward · · Score: 1

      Things always clump. The whole planet is one big clump of dirt. Nano particles don't stay that way for very long.

    2. Re:'Nano particles' by drinkypoo · · Score: 1

      How do they affect the environment?

      That's the least concern, because zinc oxide occurs naturally. The bigger concern is how they actually will affect you. They think that by making smaller particles they're going to reduce absorption?

      --
      "You're right," Fisheye says. "I should have set it on 'whip' or 'chop.'"
    3. Re:'Nano particles' by tehcyder · · Score: 1

      Things always clump. The whole planet is one big clump of dirt. Nano particles don't stay that way for very long.

      You can't argue with scientific logic like that!

      --
      To have a right to do a thing is not at all the same as to be right in doing it
    4. Re:'Nano particles' by NostalgiaForInfinity · · Score: 1

      That's the least concern, because zinc oxide occurs naturally. The bigger concern is how they actually will affect you. They think that by making smaller particles they're going to reduce absorption?

      ZnO doesn't pass through the skin at all, even as nanoparticles.

      But, yes, smaller particles often "get stuck" more easily passing through something porous than larger particles due to their larger surface area.

  12. What about when it leaks by Anonymous Coward · · Score: 1

    into the environment after you rinse it off? That must also be considered before it can be called "safe", unless of course you only care about yourself.

    1. Re:What about when it leaks by jo_ham · · Score: 1

      Zinc oxide is a natural compound. Plenty of it in the environment.

    2. Re:What about when it leaks by Anonymous Coward · · Score: 0

      Not in nano-particle form.

  13. Re:Toxic by Coisiche · · Score: 1

    I think the suspicion is that they are detrimental to the environment but it's just being studied now.

  14. Only banned in agriculture by Anonymous Coward · · Score: 1

    Citation needed.

    It's only banned in agriculture in most places and you can use it for malaria/disease control if it works (usually doesn't the mosquitoes are immune to DDT now).

    So your claim needs a citation to back it up.

    1. Re:Only banned in agriculture by Mashiki · · Score: 0

      This is pretty well known stuff. Here's some reading material for you, the ban on DDT was fear mongering nothing more. The estimate is 50m-500m dead since it was banned, there's no solid figures because no one actually knows solidly how many people have died since the ban. But you can do out the math if you really want since 40% of the worlds population lives in areas where you can contract it.

      http://dwb.unl.edu/Teacher/NSF...
      http://junkscience.com/2012/03...
      http://www.worldwatch.org/node...

      --
      Om, nomnomnom...
    2. Re:Only banned in agriculture by KGIII · · Score: 0

      You might want to do your own research. WHO has enabled the use of DDT again. The study done by the crazy chick in the 60s was based on fabricated data. Google is your friend.

      --
      "So long and thanks for all the fish."
    3. Re:Only banned in agriculture by Anonymous Coward · · Score: 1

      "Here's some reading material for you, the ban on DDT was fear mongering nothing more"

      Have you actually read this? I took it as an example of your links, but it doesn't say DDT ban was fear mongering, quite the opposite:
      http://www.worldwatch.org/node/517

      "DDT is no longer used or manufactured in most of the world, but because it does not break down readily, it is still one of the most commonly detected pesticides in the milk of nursing mothers. DDT is also one of the "dirty dozen" chemicals included in the 2001 Stockholm Convention on Persistent Organic Pollutants. The signatories to the "POPs Treaty" essentially agreed to ban all uses of DDT except as a last resort against disease-bearing mosquitoes. Unfortunately, however, DDT is still a routine option in 19 countries, most of them in Africa. "

      "But even though the campaign largely passed Africa by, DDT has not. Many African countries have used DDT for mosquito control in indoor spraying programs, but the primary use of DDT on the continent has been as an agricultural insecticide. Consequently, in parts of west Africa especially, DDT resistance is now widespread in A. gambiae. But even if A. gambiae were not resistant, a full-bore campaign to suppress it would probably accomplish little, because this mosquito is so efficient at transmitting malaria."

      In light of this, the ban on its use in agriculture seems to be sensible!

    4. Re:Only banned in agriculture by Anonymous Coward · · Score: 1

      The environmental effects of DDT were disastrous and potentially irreversible if the overuse of DDT was continued. Whole ecosystems were shaking on their foundations. Whether the limitation on the use of DDT (it was never actually banned) caused any deaths at all is hard to measure, but the figures you state are just fear mongering, there's no evidence for them whatsoever. The articles you cite to support your claims are badly sourced and full of inconsistencies and lies.

    5. Re:Only banned in agriculture by dunkelfalke · · Score: 1

      It is always funny how people link sources without actually reading them first, don't you think?

      --
      "It's such a fine line between stupid and clever" -- David St. Hubbins, Spinal Tap
    6. Re: Only banned in agriculture by Anonymous Coward · · Score: 0

      Do your research and take your on advice.
      https://en.wikipedia.org/wiki/DDT#Restrictions_on_usage

      Looks like the WHO is actually working eliminating the use of DDT altogether. Do you guys work for a chemical manufacturer or what? Thinking DDT is even remotely safe is just plain ignorance

    7. Re:Only banned in agriculture by tehcyder · · Score: 1

      It's only "pretty well known stuff" amongst anti-Environmentalist anti-government right wing nutjobs.

      --
      To have a right to do a thing is not at all the same as to be right in doing it
    8. Re: Only banned in agriculture by KGIII · · Score: 1

      http://www.who.int/mediacentre...

      Note the "clean bill of health."

      Do my own research, indeed.

      --
      "So long and thanks for all the fish."
    9. Re:Only banned in agriculture by tehcyder · · Score: 1

      You might want to do your own research. WHO has enabled the use of DDT again. The study done by the crazy chick in the 60s was based on fabricated data. Google is your friend.

      You can find countless links on Google proving that the Holocaust, 9/11 and the Moon Landings were all fabricated too.

      --
      To have a right to do a thing is not at all the same as to be right in doing it
    10. Re: Only banned in agriculture by KGIII · · Score: 1

      Also, http://www.who.int/malaria/pub...

      I forgot to link the updated Stockholm Convention decision. It is true that they're trying to get rid of ALL persistent crap - can't blame them. However, DDT is really not that harmful when used properly.

      --
      "So long and thanks for all the fish."
    11. Re:Only banned in agriculture by KGIII · · Score: 1

      Above I liked to the WHO directly.

      --
      "So long and thanks for all the fish."
    12. Re: Only banned in agriculture by Anonymous Coward · · Score: 0

      "Used properly" is the operative word. Even locales that utilized it properly found that the mosquitos built up significant resistance within a decade, which eroded it's use.

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    --
    ----------------------------------- My Other Sig Is Hilarious -----------------------------------
    1. Re:What's the best sunscreen? by Anonymous Coward · · Score: 0

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    2. Re:What's the best sunscreen? by NostalgiaForInfinity · · Score: 1

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    I am light skinned and just use spf15.
    More vitamin D studies have shown reduces flu and birth defects.

  17. The best sunscreens, in order. by Anonymous Coward · · Score: 1

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    2. Clothing.
    3. A wide-brimmed hat.
    4. Melanin. ( genetics )
    5. Common sense.

    Use 1-3 and 5 liberally, and there should be no need to apply nasty stinky possibly harmful chemical lotions unless you are pretty much without (4) ie albino or nearly so.

    source: a farmer.

    1. Re:The best sunscreens, in order. by Anonymous Coward · · Score: 1

      0. The planet earth (i.e. night time)

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    --
    Do not look at laser with remaining good eye.
  21. nano zinc oxide is not dangerous by NostalgiaForInfinity · · Score: 2

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    Based on the current weight of evidence of all available data, the risk for humans from the use of nano-structured titanium dioxide (TiO(2)) or zinc oxide (ZnO) currently used in cosmetic preparations or sunscreens is considered negligible. [...] Multiple studies have shown that under exaggerated test conditions neither nano-structured TiO(2) nor ZnO penetrates beyond the stratum corneum of skin.

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    How does it affect the aquatic environments where people will be introducing it through swimming? There's been a lot of publicity lately to suggest that nanoparticles are very harmful to the environment.

  23. Re:Skin cancer, sunburn, total hours, and sunblock by pastafazou · · Score: 1

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    The map you linked to doesn't show the total amount of hours in the sun or the number of sunburns. It does show that places where people have paler skin (the north) have a greater chance of getting skin cancer than places where people have darker skin (Africa) or where they tend to cover up (the deserts).

    The skincancer.org site does say that having more than 5 sunburns is more important for melanoma than the total hours in the sun, but it says the opposite for other forms of skin cancer. My experience (based on discussions with my wife's doctor) is that being a redhead is probably more predictive of melanoma than the number of sunburns. (Anyway, what redhead hasn't gotten more than 5 sunburns?)

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