Tesla's Elon Musk pushes space tourism as a down payment on ensuring our intergalactic salvation. And Amazon's Jeff Bezos buys the Washington Post because, well, he hasn't said. Driven by bravado, benevolence, boredom or perhaps equal measures of each, deep-pocketed and increasingly young CEOs in Silicon Valley and beyond are taking their money, power and fame and using it to plant flags in all kinds of surprising places. And unlike in the valley's olden days, when successful tech pioneers quietly assembled philanthropic powerhouses or lobbied to protect open space, there's now a land rush by tech's young titans to leave ...