The Olduvai Gorge in northern Tanzania has a geology that fossil-hunters love. A river cuts through several layers of strata with four distinct beds. Bed I, the oldest, is about 2 million years ...

The Out of Eden Walk is writer and National Geographic Fellow Paul Salopek’s multiyear, 21,000-mile storytelling odyssey across the globe in the footsteps of our ancestors. This ancient marvel ...

That would make these the oldest hominid ancestors yet identified, and the most primitive hominid species known. Discussion continues over whether Ardipithecus is a hominid or not, whether it ...