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MOSSEL BAY, SOUTH AFRICA - MAY 26: A view of stone tools on May 26, 2010, at Pinnacle Point near Mossel Bay South Africa. Caves nearby 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. These stone tools were found in cave called PP13B, and include sophisticated implements such as microblades (bottom two rows), which would have been attached to a wooden shaft to form projectile weapons. The toolmakers also appear to have heat-treated the stone to make it easier to shape?a technique that was believed to have originated much later and in France. (Photo by Per-Anders Pettersson/Getty Images)