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This is a matter of opinion, not fact, so there is no single correct answer. (How do you compare different kinds of "smartness"?) A few candidates: Archimedes, Leonardo da vinci, Galileo Galilei, Isaac newton, Johann Kepler, Carl Gauss, David Hilbert, Albert Einstein, Niels Bohr, John von Neumann, Steven Hawking.

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14y ago

What else can I help you with?