A 7 million-year-old practice set our ancestors on the course to humanity, new study finds

Researchers looked at a femur and two ulna arm bones of Sahelanthropus tchadensis, one of the earliest known human ancestors, and found signs that they walked on two feet — also known as bipedalism, according to a new study published Wednesday in Nature. “Our oldest known representatives were practicing bipedalism (on the ground and on …

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