Many of the headlines marking the passing of actress Diane Keaton this weekend have mentioned Annie Hall, the film that earned her an Oscar and made her a distinctively haphazard fashion icon. But ...

There was no physical barrier between the U.S. and Mexico for decades -- until one critical battle at the border changed it all.

The pachycephalosaurs were a unique group of dinosaurs with domed heads. But scientists haven't known much about them because their fossils have been so incomplete. A stunning discovery from southern ...