Freeman Dyson’s Life, Through His Letters

The cross-country ride referred here where Dyson got his inspiration is I think the return from his road-trip with Feynman, where the "peeing in the sink" incident happens :-)

Dyson reminisces about that trip thus: https://www.youtube.com/watch?v=g_QF0-C5oLc

I don't think I can be as humble as he is at that age.