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Ancient footprints yield oldest signs of upright gait

Human ancestors may have been walking with an efficient, extended-leg technique by 3.6 million years ago

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12:47pm, March 22, 2010

Despite a penchant for hanging out in trees, human ancestors living 3.6 million years ago in what’s now Tanzania extended their legs to stride much like people today do, a new study finds. If so, walking may have evolved in leaps and bounds, rather than gradually, among ancient hominids.

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