Scientists have a mystery on their hands after the discovery of 330 stone tools about 2.9 million years old at a site in Kenya, along Lake Victoria's shores, that were used to butcher animals, including hippos, and pound plant material for food. Which of our prehistoric relatives that were walking the African landscape at the time made them? The chief suspect, researchers said on Thursday in describing the findings, may be a surprise. The Nyayanga site artifacts represent the oldest-known examples of a type of stone technology, called the Oldowan toolkit, that was revolutionary, enabling our forerunners to process diverse foods and expand their menu. Three tool types were found: hammerstones and stone cores to pound plants, bone and meat, and sharp-edged flakes to cut meat. To pu...
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