Evolution

Lucy's ability to walk on two legs on land may have hindered her ability to navigate trees.

Our relationship with the bacteria in our guts extends far back into our evolutionary past — before modern humans even existed, a new study finds.

Scientists found that modern-human footprints and the tracks left behind by Homo erectus are nearly indistinguishable.

The most recently discovered extinct human species may have lived less than 1 million years ago, suggesting the small-brained hominin lived alongside several other hominins.

The newfound ancestors may have been even littler than the hobbits, and date much further back in time, from some 700,000 years ago.

Human babies require years to learn basic survival skills like walking and feeding themselves.

Neanderthal men carried a Y chromosome that often may have led to miscarriages if or when Neanderthals and modern humans got together, new research suggests.

The map reveals how extensively past interbreeding has affected people alive today.

Scientists who forced volunteers to chew raw goat flesh (yes, chew) have found that such meat-gnawing likely caused human teeth and jaws to shrink throughout our evolutionary history.