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Why are there no nonhuman primates with an existing complex gestural language? One possible answer, it seems to me, is that humans have systematically exterminated those other primates who displayed signs of intelligence.

~ Carl Sagan ~

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Why are there no nonhuman primates with an existing complex gestural language? One possible answer, ...

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Carl SaganDragons of Eden: Speculations on the Evolution of Human Intelligence

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