How 15 Tech Tycoons Spend Their Fortunes
That's a high-class problem faced by the moguls on this list.
Naturally, many of them buy expensive things, like cars, houses, planes—even islands.
But even if you're Larry Ellison, with a seemingly endless appetite for that stuff, there comes a time when you want to do more.
Maybe it's solving the world's problems, or just indulging in a geeky fantasy.