There's nothing - I've bought everything I want. I don't like yachts or anything; you know, I'm not a yacht person, and I've got pretty much the nicest plane I'd want to have.

Starting and growing a business is as much about the innovation, drive and determination of the people who do it as it is about the product they sell.

What most people know but don't realize they know is that the world is almost entirely solar-powered already. If the sun wasn't there, we'd be a frozen ice ball at three degrees Kelvin, and the sun powers the entire system of precipitation. The whole ecosystem is solar-powered.

I just want to retire before I go senile because if I don't retire before I go senile, then I'll do more damage than good at that point.

Entrepreneurship is like eating glass and walking on hot coals at the same time

Engineering is the closest thing to magic that exists in the world.

The reality is gas prices should be much more expensive then they are because we're not incorporating the true damage to the environment and the hidden costs of mining oil and transporting it to the U.S. Whenever you have an unpriced externality, you have a bit of a market failure, to the degree that eternality remains unpriced.