Our ancestors were making stone tools even earlier than we thought—some 700 ka older, dating to 3.3 ma ago, in northern Kenya. “These aren’t the very first tools that hominins made. They show that the knappers already had an understanding of how stones can be intentionally broken, beyond what the first hominin who accidentally hit 2 stones together and produced a sharp flake would have had. I think there are older, even more primitive artifacts out there.”

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