This image provided by the Smithsonian's Human Origins Program shows artifacts found in southern Kenya's Olorgesailie Basin. For hundreds of the thousands of years, people living there made and used large stone-cutting tools called handaxes, left. At right are more sophisticated tools, found in the same area, which were carefully crafted and more specialized than the large, all-purpose handaxes. (Smithsonian - Human Origins Program via AP)
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