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Mary Leakey (1913 -), palaeoanthropologist, seen here with some of the hominid fossil finds uncovered at Laetoli, Tanzania. The fossils here include the 3.5 million year old mandibles and teeth from the australopithecine group. Mary Leakey was married to the palaeoanthropologist Louis Leakey. (KEYSTONE/SCIENCE PHOTO LIBRARY/JOHN READER)