Evolve or die: Why our human ancestors learned to be social more than 320000 years ago

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The authors found that for roughly 700,000 years, from 1.2 million to 499,000 years ago, the hominids who populated this basin relied almost entirely on one simple, all-purpose stone tool known as a hand ax. It was generally between 4 and 10 inches long, shaped like a teardrop and chipped all the way around.

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