If you don't know much about the history of mathematics, Johnny Von Neumann was an hungarian mathematician, an extremely brilliant polymath, one of the greatest mathematicians of all time. He is the founder of Game Theory and also was one of the first mathematicians to write a rigorous mathematical treatment of quantum mechanics, among many other accomplishments
I have trouble believing such a human being actually existed, I honestly do
here are some of the anecdotes people have said about him, usually from brilliant intellectuals
Hans Bethe: " "I have sometimes wondered whether a brain like von Neumann's does not indicate a species superior to that of man".
Eugene Wigner , "one had the impression of a perfect instrument whose gears were machined to mesh accurately to a thousandth of an inch." and also said "only he was fully awake"
Paul Halmos " "von Neumann's speed was awe-inspiring"
Israel Halperin ""Keeping up with him was ... impossible. The feeling was you were on a tricycle chasing a racing car."
Edward Teller said "he could never keep up with him"
he also said ""von Neumann would carry on a conversation with my 3-year-old son, and the two of them would talk as equals, and I sometimes wondered if he used the same principle when he talked to the rest of us..
Lothar Wolfgang Nordheim " "fastest mind I ever met"
Jacob Bronowski ""He was the cleverest man I ever knew, without exception. He was a genius."
George Polya " "Johnny was the only student I was ever afraid of. If in the course of a lecture I stated an unsolved problem, the chances were he'd come to me at the end of the lecture with the complete solution scribbled on a slip of paper."
Jean Diudonne " "may have been the last representative of a once-flourishing and numerous group, the great mathematicians who were equally at home in pure and applied mathematics and who throughout their careers maintained a steady production in both directions"
Peter Lax "most scintillating intellect of this century"
https://en.wikipedia.org/wiki/John_von_Neumann