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Are you dreaming now?

Are you dreaming right now? How do you know you're not? Rene Descartes set himself a pretty titanic task: to doubt absolutely everything he cannot be certain of - even that the world exists! - and then try to see if we can rebuild our knowledge of ourselves and the world only from what we can be really certain of. In the process, he formulated some provocative thoughts on the radical separation of the mind from the body.

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