Everyone would not be taking drugs if they were legal. Drugs being illegal is hardly an obstacle at all for people who wish to obtain them. Furthermore, alcohol, nicotine, and caffeine are all legal and potentially addictive drugs, and so is salvia. Yet we don't see everyone addicted to these.
It's just easier.
Should automatic crossbows be illegal?
If you're hunting something (or even shooting a discus), and you miss, you don't have time to reload before you lose the target.
Besides, it only takes one shot to kill something.
I prefer straight PDF.
PS is the most typical type of LaTeX file, hence GSView is almost exclusively used to view LaTeX documents.
There is a significant quality loss in converting to PDF, so you should really install GSView... but here it is:
http://fafalone.hypermart.net/lectures.pdf
You can't really apply rigid body dynamics to individual atoms, since they're not really rigid bodies, as 99% of the space an atom occupies is electrons, which are standing waves.
But as far as simulating molecular interactions, ChemCAD is the way to go. Hopefully your university already has it, or it's going to cost $20,000... and it's not open source.
Guns should not be illegal because they can be used for a crime.
By this trend, baseball bats ought to be outlawed because of the number of acts of vandalism and lethal assault they are used for.
Knives should be illegal, because you might stab someone with them.
And of course, you can kill someone with your bare hands.
Make laws against the crime, not the weapon... because the definition of a weapon is far too broad.
(On a side note for Americans, felt-tip markers are illegal under the DMCA. This is a perfect example of what I'm talking about.)
What do people like me do at 1:40AM? Read science articles of course! While browsing a collection of old physics articles Nature had a special on, I came across one of particular interest.
http://www.nature.com/physics/lookingback/einstein/einstein.pdf
Einstein himself explains how he came up with general relativity.
Parallel universes are based on alternate probabilities, those things are simply not possible, which the exception of me playing tennis well, which takes place in this universe.
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