A former student, who was also once a student of Tomonaga’s, wrote to extend his congratulations. Feynman responded, asking Mr. Mano what he was now doing. The response: “studying the Coherence theory with some applications to the propagation of electromagnetic waves through turbulent atmosphere… a humble and down-to-earth type of problem.” Dear Koichi, I was very happy to hear from you, and that you have such a position in the Research Laboratories. Unfortunately your letter made me unhappy for...