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But the response to this is,
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"They are smart but we know that smart isn't enough."
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We know that the human capacity for language
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is not totally a result of smartness.
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There are smart children who,
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due to some deficit in their language capacity,
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don't speak or understand a language.
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So, the smartness of chimpanzees does not in itself demonstrate
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that they should be able to learn language.
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You might also point out correctly
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that chimps are our nearest evolutionary relatives,
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which is right, so you--one would expect on the face of it--