Ten years ago, the idea of getting into a stranger’s car, or 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 are household names: redefining neighbourhoods, 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, a new generation of entrepreneurs is sparking yet another cultural upheaval through technology. They are among the Upstarts, idiosyncratic founders with limitless drive and an abund