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7-Million-Year-Old Sahelanthropus Fossils Bolster Case for Earliest Upright Walking

For more than two decades, Sahelanthropus tchadensis -- a very early (6.7 to 7.2 million years old) hominin species discovered in Chad in 2001 -- has hovered at the center of a contentious question: did one of humanity’s earliest relatives walk upright?

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