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MOSSEL BAY, SOUTH AFRICA - MAY 26:  Dr. Curtis Marean (c) poses for a portrait inside a cave called PP13B on May 26, 2010, at Pinnacle Point near Mossel Bay South Africa. The cave sheltered humans between 164,000 and 35,000 years ago, at a time when Homo sapiens was in danger of dying out. These people may have been the ancestors of us. Curtis Marean received his Ph.D. from the University of California at Berkeley in 1990, and is now a member of the Institute of Human Origins and School of Human Evolution and Social Change at Arizona State University. His research interests focus on the origins of modern humans, the prehistory of Africa, the study of animal bones from archaeological sites and climates and environments of the past. (Photo by Per-Anders Pettersson/Getty Images)