13. Leonhard Euler
was a Swiss mathematician and physicist. Born in 1707 and educated in Basel, Euler spent most of his career in St. Petersburg and Berlin. His estimated IQ scores range from 180 to 200 by different measures. Euler was one of the founders of pure mathematics and further developed the study of integral calculus. He authored "Inroduction of Analysin Infinitorum" and his complete works fill about 90 volumes. He had a legendary memory and could recite the entire "Aeneid" word-for-word.