PBS has published an interview with dr. John Nash of Princeton University. John Nash received a Nobel prize in economics in 1994 for pioneering the equilibrium analysis of non-cooperative games. The interview can be read and seen as a video here.
On Discovering Math
"I was in grade school. I would be doing arithmetic, and I found myself working with larger numbers than other students would be using. I would have several digits, and they would have maybe two or three digits. I would do multiplication and basic operation, but with larger numbers. Later on in adolescence, I got some practice in using a calculator machine, where you could multiply and add, subtract and divide really large numbers like 10 digits."