In honor of America's 250th birthday, here are 50 must-see American movies that celebrate who we are, who we've been and who ...

Evolution is always happening — so why can't we see it? A biologist explains the timescale problem, election pressure, and ...

Credit: Gaorong Li and Xiaodong Wang New fossils hint that the roots of complex animal life stretch further back than ...

A new study suggests Earth may have been sending tiny hitchhikers to Venus for billions of years. Researchers found that asteroid impacts could launch microbes into space, where some might survive the ...