Princeton, Path Integrals, and the Manhattan Project
The move to Princeton was the beginning of an intense period for Feynman. He succeeded in finding a completely new way of looking at quantum mechanics. He also took part in the Manhattan project, the USA’s attempt to beat Germany to the construction of a nuclear bomb during the Second World War. And finally he had to cope with a private tragedy, because Arline, his childhood sweetheart and later wife, died of tuberculosis shortly before the end of the war.