Researchers digging in Kenya say they've found the oldest stone tools ever discovered, at 3.3 million years old — pushing the record back by around 700,000 years. That places these tools before the birth of Homo, the genus that includes modern humans; as such, it calls into question the conventional belief that it was species within Homo that first learned how to work with stone tools. The findings are being published today in Nature.
Stone tools found in Kenya are the oldest ever discovered
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