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Fossil Pushes Upright Walking Back 2 Million Years, Study Says |
Computer analysis of a fossil thigh bone indicates that a chimp-size human-like creature walked on two legs as early as six million years ago. Walking on two legs, known as bipedalism, is considered by scientists to be a distinguishing characteristic in what sets humans apart from apes.
Until now, the most widely accepted date for the advent of bipedalism was about four million years ago. That's when the hominids known as Australopithecus anamensis, lived. Hominids include humans and extinct near humans.
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