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OLDEN ARCHES

The bones of a human foot curve upward to form arches, including a toe bone that corresponds in crucial ways to a 3.2-million-year-old Australopithecus afarensis toe fossil (above foot). Researchers say that this shared toe trait indicates that early hominids walked much as people do today. Credit: Kimberly Congdon, C. Ward, Elizabeth Harman

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