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How do you know that most of your of life hasn't been a dream? That you won't wake up suddenly, find yourself just 14 years old in your bed, with all your subsequent "life" just a vivid dream?
For that matter, how do you know you aren't just a disembodied brain in a vat somewhere, hooked up to some alien contraption, with all your memories an illusion?
Is it possible to ever be certain of anything at all, even of the most basic questions such as the state of your existence?
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