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African geology may hold clues to prehistoric man walking upright

Why did our ancestors start walking upright? Ancient terrain may hold clue. (via The Christian Science Monitor) Copyright ImageClick to View A reconstruction of the skeleton of Australopithecus sediba, center, stands next to a modern human female, left, and a male chimpanzee. (Lee R. Berger/University of the Witwatersrand/AP) Being four-legged…