DES BARTLETT / SCIENCE PHOTO LIBRARY DES BARTLETT / SCIENCE PHOTO LIBRARY
Louis Leakey (1903-1972), British palaeontologist. He is standing next to the Paranthropus boisei (formerly Australopithecus and Zinjanthropus boisei) fossil skull that his wife, Mary Leakey, 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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