So far Terence Tao is the most intelligent guy alive.
Born 17 July 1975 and he's an Australian-American mathematician.
Tao exhibited extraordinary mathematical abilities from an early age, attending university-level mathematics courses at the age of 9. He and Lenhard Ng are the only two children in the history of the Johns Hopkins' Study of Exceptional Talent program to have achieved a score of 700 or greater on the SAT math section while just nine years old.
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From @codywills