The discovery of 25 dangerously pointy stone weapons in a South African cave shows that humans mastered a complex weapon-creating technique during the Stone Age, some 77,000 years ago, according to a new study.

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The discovery of 25 dangerously pointy stone weapons in a South African cave shows that humans mastered a complex weapon-creating technique during the Stone Age, some 77,000 years ago, according to a new study.