3.3-million-year-old Handmade Stone Tools Found in Kenya Predate Any Known Humans

Researchers say that the oldest handmade stone tools discovered yet predate any known humans and may have been wielded by an as-yet-unknown species. The 3.3-million-year-old stone artifacts are the first direct evidence that early human ancestors may have possessed the mental abilities needed to figure out how to make razor-sharp stone tools. The discovery also rewrites the book on the kind of environmental and evolutionary pressures that drove the emergence of toolmaking.

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