Ten years ago, the idea of getting into a stranger's car, or a walking into a stranger's home, would have seemed bizarre and dangerous, but today it's as common as ordering a book online. Uber and Airbnb have ushered in a new era: redefining neighborhoods, challenging the way governments regulate business, and changing the way we travel. In the spirit of iconic Silicon Valley renegades like Steve Jobs and Bill Gates, another generation of entrepreneurs...