Maybe you've seen the T-shirts or the mugs, the silhouette of an ape standing up straighter and straighter, finally morphing into a modern coffee-drinking man. Scientists have long known human ...

What does it mean to be human? For a long time, the answer seemed clear. Our species, Homo sapiens — with our complex thoughts and deep emotions — were the only true humans to ever walk the Earth.

Researchers say recently discovered teeth come from a previously undiscovered species of Australopithecus, adding to our understanding of human evolution. Maybe you've seen the T-shirts or the mugs, ...