DES BARTLETT / SCIENCE PHOTO LIBRARY DES BARTLETT / SCIENCE PHOTO LIBRARY
Louis and Mary Leakey (1903-1972 and 1913-1996), British palaeontologists. They are holding the Paranthropus boisei (formerly Australopithecus and Zinjanthropus boisei) fossil skull that Mary discovered in Olduvai gorge, Tanzania, in 1959. The skull is 1.75 million years old. Louis and Mary Leakey also made other significant discoveries in Olduvai gorge, including stone tools, the remains of Homo habilis and the Laetoli footprint trail that showed that hominids had acquired a bipedal gait by 3.6 million years ago.
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