In 1947, Kurt Gödel, Albert Einstein, and Oskar Morgenstern drove from Princeton to Trenton in Morgenstern’s car. The three men, who’d fled Nazi Europe and become close friends at the Institute for Advanced Study, were on their way to a courthouse where Gödel, an Austrian exile, was scheduled to take the U.S.-citizenship exam, something his two friends had done already. Morgenstern had founded game theory, Einstein had founded the theory of relativity, and Gödel, the greatest logician since Aristotle, had revolutionized mathematics and philosophy with his incompleteness theorems. Morgenstern drove. Gödel sat in the back. Einstein, up front with Morgenstern, turned around and said, teasing, “Now, Gödel, are you really well prepared for this examination?” Gödel looked stricken.