Gibbon feet provide model for early human walking

Scientists at the University of Liverpool have found that early humans could have walked successfully on a 'flexible' flat foot, similar to modern day gibbons. The arched 'rigid' foot of modern humans - thought to have appeared approximately 1.8 million years ago - is best adapted for upright walking, but scientists have found that early humans once had 'flexible' feet and could have walked on the ground some years earlier...

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