Tech Philanthropists Are Giving Away Billions to Build a Better Future

They're often featured as James Bond villains -- super-rich megalomaniacs who pour their infinite resources into sophisticated doomsday devices, private rockets for last-minute escapes, and enough high-tech toys to rival the NSA, FBI and CIA combined. It's easy to vilify the mega-rich, but billionaires and multi-millionaires (on occasion) do some good for society. One class, in particular, could be viewed as a type of Bond anti-villain. About half of the top 50 philanthropist dollars in...