Modern humans descended from not one, but at least two ancestral populations that drifted apart and later reconnected, long before modern humans spread across the globe.

"Our history is far richer and more complex than we imagined," said human evolutionary geneticist Aylwyn Scally.

Penn State researchers propose that Earth and life have evolved together in a way that is more typical of life-supporting ...

Farming arose on multiple continents among populations with radically different cultures and environments and with no means ...

SARS-CoV-2 has been evolving the ability to evade the immune system about twice as fast as the fastest-evolving flu virus. It ...