Science joke. You should probably just move along.
http://www.xkcd.com/21/
A whirlpool!
http://www.xkcd.com/22/
It's depressing how many of these are real shirts
http://www.xkcd.com/23/
I love the idea here, though of course it's not a great-quality drawing or scan.
http://www.xkcd.com/24/
:(
http://www.xkcd.com/25/
That cat has some serious periodic components
http://www.xkcd.com/26/
Disgusting
http://www.xkcd.com/27/
Hell if I know
http://www.xkcd.com/28/
So he's saying that God thought Hitler's art was so bad that the Holocaust was an acceptable alternative. It's no secret that the hat guy is closely based on Aram, from Men in Hats.
http://www.xkcd.com/29/
Some people haven't heard of the Donner Party. They were pioneers who got stranded and likely resorted to cannibalism.
http://www.xkcd.com/30/
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