36 Comments

  1. By the time Homo sapiens emerged about 200,000 years ago, the human brain had swelled from about 350 grams to more than 1,300 grams. In that 3-million-year sprint, the human brain almost quadrupled the size its predecessors had attained over the previous 60 million years of primate evolution. Throwing rocks and BBQing don't begin to explain it.

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