Jeb Kinnison grew up in the Midwest, son of a schizophrenic father and a hardworking single mother. He studied computer and cognitive science at MIT, and wrote programs modeling the behavior of simulated stock traders and the population dynamics of economic agents. He went on to do supercomputer work at a think tank that developed parts of the early Internet (where the engineer who decided on '@' as the separator for email addresses worked down the hall.) Later he founded an investment management company, which enabled him to retire at 47. Happily married, he writes to explain how things reall...