Serrations at the edges of a fossilized flipper of the ancient marine reptile Temnodontosaurussuggests it may have been able to swim silently.

Worldwide, the oldest known artifact of this type is a bone knife that was manufactured by modern humans in Morocco around 90,000 years ago. The revelation that Neanderthals were also working with ...

For centuries, humans have lived underground. Today, that ancient practice is under dire threat—even as cave life makes more ...