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If you drink alcohol
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it affects your reasoning.
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But he could only wave his hands
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as to how this physical thing in the world
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could connect to an immaterial mind.
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Descartes, when he was alive, was reasonable enough concluding
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that physical objects cannot do certain things.
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He was reasonable enough in concluding, for instance, as he did,
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that there's no way a merely physical object
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could ever play a game of chess
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because-- and that such a capacity
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is beyond the capacity of the physical world