Max Levchin learned to write code out of necessity. His mother's necessity, specifically.

Levchin co-founded PayPal, reaped a windfall from its IPO and sale, and became one of the best-connected investor/entrepreneurs in Silicon Valley. But before all that, he was a teenage refugee from the Soviet Union, figuring out how to make his mark at the dawning of the consumer Internet era.

Before the family had left Ukraine in the early 1990s, Soviet officials had given Levchin's mother a poorly translated programming manual, a PC, and a mandate: Learn to program it. Mother and son took turns reading each other the manual, and by the time they moved to the U.S., both knew how to code.