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  • Human ancestors have been using stone and other tools since long before the emergence of Homo sapiens approximately 200,000 years ago.[12] The earliest methods of stone tool making, known as the Oldowan industry, date back to at least 2.3 million years ago,[13] with the earliest direct evidence of tool usage found in Ethiopia within the Great Rift Valley, dating back to 2.5 million years ago.[14
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