SOME DREAMERS change the world. I recently met a man who was passionate about the big questions of the future. He was only interested in questions that would improve the lives of at least 1 billion people. How will you make fresh water to quench the planet? Can electricity be delivered wirelessly? Can we make a school for politicians? He was restless, passionate, controversial, refreshing. Impatient, bold, eager for a better planet. A remarkable encounter.