How red light revealed that the Universe is expanding

We have known for some time that the universe is expanding, and that its expansion is accelerating. But how do we know that? We'll show you how Edwin Hubble revealed that the universe is getting away from us. » 9/11/13 1:44pm 9/11/13 1:44pm

25 Great Books By Legendary Scientists

From Darwin and Einstein to Hawking and Sagan, here are twenty-five amazing books written by world-famous scientists. These are legendary texts, popular science explainers, personal memoirs, and controversial new theories, and they're all enduring monuments to the power of science. » 4/20/11 9:20am 4/20/11 9:20am