In 1970, a 14-year-old boy dialed into a nationwide computer network, uploaded a virus he had written and caused the entire network to crash.
That boy was Bill Gates. Five years later, he founded Microsoft.
A few years later, two young men went around college dorms in California selling boxes of wires that let students bypass telephone-company restrictions and make long-distance calls for free.
Those young men were Steve Jobs and Steve Wozniak, and a later venture they started, Apple, is now the most valuable company in the world.