The energy of the radio frequency photons (waves) used in cell phones each have a tiny fraction of the energy (~1 millionth) required to ionize atoms and about (10^(-5)) required to break chemical bonds. There is no physical mechanism for cell phones to cause cancer (well, maybe eating them). The real result is with over 1 billion cell phones in daily use, there's been no uptick in brain cancer rates in recent years.
Entropy is the log of the number of available states. If you start with large N atoms, you have a huge, but calculable entropy. If you now let the atoms form molecules, the entropy of the system goes up, even though a molecule is more complex than single atoms. The energy from the sun provides heat that moves stuff around and close enough for bonding (and sometimes splitting those bonds). Eventually, you fill up the statistical distribution of allowed states (chem compounds, complex organic molecules, etc.). All the while the entropy of the entire system is increasing. It's very simple. Second law of thermodynamics drives at least basic evolution towards complexity within pockets of a system.
No kidding - I had this idea 30+ years ago in grad school while waiting to fall asleep for the night. Fantastic idea and I knew on the spot it to be true that the second law of thermodynamics *drives* evolution. Figured it wasn't new, but was still happy that I thought of it, and next day checked the library - yep it wasn't a new idea even 30 years ago...
As a kid my dad had a bunch of SF books around, so I just picked them up w/o him trying to foist them on me. For content, I recommend the anthologies that are out there "best SF of YEAR".
Also, there's a lot of Escape Pod (escapepod.org) podcasts that are age appropriate - download and play on longer car trips.
Good question - unemployment isn't much of a problem from what I understand, but underemployment (employed in a related field) is. It's important to meet as many people as possible. I went to the biggest grad school that would accept me and that I felt I could succeed in (U. Texas Austin) because they had TA support, and people working in almost every subfield (I wasn't sure what I wanted to do). Beyond working hard (my advisor: "every time you're eating an ice cream cone, some Caltech weanie is at the computer lab working, and that's who you're really competing with, not those here in our department"), give a lot of presentations at meetings and in house. There's a book "Don't be such a scientist: Talking substance in an age of style" by Randy Olson that's pretty good. Anyway, yes, it's not easy, and your reward if you make it is a smaller salary and longer hours than if you'd just focussed on money... but it's a great gig if you can get it. Oh, and I have been at a relatively small school with a higher teaching load - that's still the norm unless you're a real star.
Good luck and have fun,
Matt
Agreed. I've been a professor for 20 years. I can't imagine a better job. Research is still fun sometimes to the point of controlled obsession, teaching is satisfying and the students are mostly good to great, the downsides of the job are minimal, and the pay is good. There's nothing else I'd rather do.
Matt Wood, Professor
Dept Physics & Space Sciences
Florida Institute of Technology
Melbourne, FL 32901
I've got sitting on my desk a few quotes from this week along these lines: 32 cores, 32 GB ram 2 TB Raid 1, 23" monitor. --> $8k
Matt A. Wood, Professor
FIT Physics & Space Sciences
The sun's radius is about 100x Earth's radius, and Earth orbit is about 200 solar radii. Our unmanned spacecraft have gone about 40x this distance. Shrink the sun down to the size of a softball and typical interstellar distances scale to about 3500 km. The energy requirements to make such a trip are extraordinary (if not prohibitive). The time to make the trip is also quite substantial, even accelerating at a constant 1g.
Short answer: If they have the tech to get here, they can do whatever they want, and we'd have no defense. Easiest: raise enough dust/soot in the atmosphere (nuclear weapons in remote areas, or just targeted asteroids) for a few years to block the sun. Sagan's "nuclear winter". Clean up, move in, or move on.
Matt
--
"Quando Omni Flunkus Moritati" (When all else fails, play dead)
At my university, computer purchases over $1500 are capital equipment, and so not subject to overhead charges. Under $1500, the grant gets charged 44% for indirect costs. So, purchase a $1k PC or a $1500 Mac - same cost to the researcher's grant.
Slashdot Mirror
The energy of the radio frequency photons (waves) used in cell phones each have a tiny fraction of the energy (~1 millionth) required to ionize atoms and about (10^(-5)) required to break chemical bonds. There is no physical mechanism for cell phones to cause cancer (well, maybe eating them). The real result is with over 1 billion cell phones in daily use, there's been no uptick in brain cancer rates in recent years.
Entropy is the log of the number of available states. If you start with large N atoms, you have a huge, but calculable entropy. If you now let the atoms form molecules, the entropy of the system goes up, even though a molecule is more complex than single atoms. The energy from the sun provides heat that moves stuff around and close enough for bonding (and sometimes splitting those bonds). Eventually, you fill up the statistical distribution of allowed states (chem compounds, complex organic molecules, etc.). All the while the entropy of the entire system is increasing. It's very simple. Second law of thermodynamics drives at least basic evolution towards complexity within pockets of a system.
No kidding - I had this idea 30+ years ago in grad school while waiting to fall asleep for the night. Fantastic idea and I knew on the spot it to be true that the second law of thermodynamics *drives* evolution. Figured it wasn't new, but was still happy that I thought of it, and next day checked the library - yep it wasn't a new idea even 30 years ago ...
As a kid my dad had a bunch of SF books around, so I just picked them up w/o him trying to foist them on me. For content, I recommend the anthologies that are out there "best SF of YEAR". Also, there's a lot of Escape Pod (escapepod.org) podcasts that are age appropriate - download and play on longer car trips.
Good question - unemployment isn't much of a problem from what I understand, but underemployment (employed in a related field) is. It's important to meet as many people as possible. I went to the biggest grad school that would accept me and that I felt I could succeed in (U. Texas Austin) because they had TA support, and people working in almost every subfield (I wasn't sure what I wanted to do). Beyond working hard (my advisor: "every time you're eating an ice cream cone, some Caltech weanie is at the computer lab working, and that's who you're really competing with, not those here in our department"), give a lot of presentations at meetings and in house. There's a book "Don't be such a scientist: Talking substance in an age of style" by Randy Olson that's pretty good. Anyway, yes, it's not easy, and your reward if you make it is a smaller salary and longer hours than if you'd just focussed on money... but it's a great gig if you can get it. Oh, and I have been at a relatively small school with a higher teaching load - that's still the norm unless you're a real star. Good luck and have fun, Matt
Agreed. I've been a professor for 20 years. I can't imagine a better job. Research is still fun sometimes to the point of controlled obsession, teaching is satisfying and the students are mostly good to great, the downsides of the job are minimal, and the pay is good. There's nothing else I'd rather do. Matt Wood, Professor Dept Physics & Space Sciences Florida Institute of Technology Melbourne, FL 32901
"The Sun is not a solar-type star" was my favorite quote from the 1st NASA Kepler Conference held Dec 2011!
He's saying 1/2 million per passenger, not per trip.
You can haz your acids, but all your base are belong to us!
Prediction: In 2 years they'll give you a tablet when you subscribe to Amazon Prime.
Matt Wood
Melbourne, FL
I watched the press conference, and they suggested it likely had about half of it's mass as a solid rocky core, the other half as gas.
I've got sitting on my desk a few quotes from this week along these lines: 32 cores, 32 GB ram 2 TB Raid 1, 23" monitor. --> $8k Matt A. Wood, Professor FIT Physics & Space Sciences
The Book by Taylor and Wheeler "Exploring Black Holes: Introduction to General Relativity" is very nice, and roughly at your level. http://www.amazon.com/Exploring-Black-Holes-Introduction-Relativity/dp/020138423X/ref=sr_1_2?ie=UTF8&qid=1314560336&sr=8-2 Matt A. Wood Physics & Space Sciences Dept Florida Institute of Technology Melbourne, FL 32901
It's nearly always phrased this way. It was discovered within hours of the initial signal of the explosion reaching earth. Matt Wood
The sun's radius is about 100x Earth's radius, and Earth orbit is about 200 solar radii. Our unmanned spacecraft have gone about 40x this distance. Shrink the sun down to the size of a softball and typical interstellar distances scale to about 3500 km. The energy requirements to make such a trip are extraordinary (if not prohibitive). The time to make the trip is also quite substantial, even accelerating at a constant 1g. Short answer: If they have the tech to get here, they can do whatever they want, and we'd have no defense. Easiest: raise enough dust/soot in the atmosphere (nuclear weapons in remote areas, or just targeted asteroids) for a few years to block the sun. Sagan's "nuclear winter". Clean up, move in, or move on. Matt -- "Quando Omni Flunkus Moritati" (When all else fails, play dead)
Science News is good if you like printed material. It's bi-weekly and gives moderate detail. http://www.sciencenews.org/
I'd appreciate an invite: matt.wood61(gmail)
They are analog, certainly. They can have any energy. Even energies of photons emitted by a laser have some small dispersion in energies.
At my university, computer purchases over $1500 are capital equipment, and so not subject to overhead charges. Under $1500, the grant gets charged 44% for indirect costs. So, purchase a $1k PC or a $1500 Mac - same cost to the researcher's grant.
EAperture Science
Oil will have a far higher heat capacity than air, so the heating rate after pump failure would be far slower than after an air handler failure.
In fact show me ONE form of government that is fair. Because I cant find one that exists ANYWHERE on this planet.
Bhutan? http://en.wikipedia.org/wiki/Bhutan#Government_and_politics
Does this broad line region make my butt look massive?
No. Free. Lunch.
I would mod you up if I had points!