Great comment. Was curious w/ regards to Ulam. Found this on Wikipedia: In January 1946, he suffered an acute attack of encephalitis, which put his life in dan

Great comment. Was curious w/ regards to Ulam. Found this on Wikipedia: In January 1946, he suffered an acute attack of encephalitis, which put his life in danger, but which was alleviated by emergency brain surgery. ... Another friend, Gian-Carlo Rota, asserted in a 1987 article that the attack changed Ulam's personality: afterwards, he turned from rigorous pure mathematics to more speculative conjectures concerning the application of mathematics to physics and biology; Rota also cites Ulam's former collaborator Paul Stein as noting that Ulam was sloppier in his clothing afterwards, and John Oxtoby as noting that Ulam before the encephalitis could work for hours on end doing calculations, while when Rota worked with him, was reluctant to solve even a quadratic equation. https://en.wikipedia.org/wiki/Stanislaw_Ulam https://en.wikipedia.org/wiki/Stanislaw_Ulam