The CEO of Amazon showed an aptitude for mechanics as a baby, when he attempted to dismantle his own crib. He's been set on building for most of his life, and today his online retail giant is worth billions.

Bezos worked at McDonald's for a summer when he was a teenager. By the following year he'd caught the entrepreneurial bug, and started a summer camp for kids who wanted to learn about science. He charged $600 each to the six neighborhood kids who signed up.

And though he's now a billionaire, Bezos put in the hard labor as a kid, working on his grandfather's ranch "laying pipe, vaccinating cattle and fixing windmills," according to a Seattle Times interview.