Sharks are the most feared predators in the sea, and their survival hinges on fearsome teeth that regrow throughout their lives. But changes in the ocean’s chemistry could put those weapons at risk.

At first glance, this mammal looks like a horse gone terribly wrong. But, in reality, Chalicotherium is far from a botched ...

A fossilized foot discovered in Ethiopia and left unclassified for over a decade has now been linked to a little-known human ...