Three upright walkers, including Lucy (center) and two specimens of Australopithecus sediba, a human ancestor from South Africa dating back nearly 2 million years. Image compiled by Peter Schmid and courtesy of Lee R. Berger/Wikimedia Commons

When and how was walking invented?

Walking has taken a very long time to develop, with evidence of bipedalism among early humans in Africa roughly 4.4 million years ago.

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