PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Homo habilis skull. This skull, found in the Olduvai Gorge in Tanzania, is around 1.8 million years old. H. habilis was an ancestor of modern humans (H. sapiens sapiens) that lived between around 2.1 and 1.6 million years ago. Their brains were small though, with a cranium volume of around 700 cubic centimetres (compared to around 1350cc for modern humans).
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