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2011-02-11 06:25:00

A fossilized arched foot bone recovered from Ethiopia shows that our human ancestors walked upright 3.2 million years ago, according to a study published Thursday in the journal Science.The fossil, a fourth metatarsal, or midfoot bone, belongs to a group of the famed hominid Lucy, and indicates that a permanently arched foot was present in the species Australopithecus afarensis.  The findings are the first evidence to address the question of how this species moved around."This fourth...