Have your senses ever deceived you? If so, why do you still trust your senses? How do you know that you're
awake when you are? How do you know that you're not dreaming right now? Do you agree that it's possible
that you are just a brain in a vat being stimulated to think that you have hands and that there is an external
world around you? If so, do you agree that you don't know that you have hands and that you don't know that
there are things around you? If not, why?
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