The 50th anniversary of the fall of Saigon this week will trigger complex and mixed emotions for those who lived through it.

The ocean's deep-sea bed is scattered with ancient rocks, each about the size of a closed fist, called "polymetallic nodules.

Knife-toothed reptiles called sebecids went extinct on the mainland 10 million years ago. New fossil evidence puts them on an island 4 million years ago.

This can include things like trip cancellation coverage, so you can recover pre-paid costs or trip interruption in the event your vacation is interrupted by an unexpected event. There's also ...