When I was in college, I wanted to be involved in things that would change the world.

If we drive down the cost of transportation in space, we can do great things.

I'm extremely confident that solar will be at least a plurality of power, and most likely a majority... in less than 20 years.

Persistence is very important. You should not give up unless you are forced to give up.

My motivation for all my companies has been to be involved in something that I thought would have a significant impact on the world.

The revolutionary breakthrough will come with rockets that are fully and rapidly reusable. We will never conquer Mars unless we do that. It'll be too expensive. The American colonies would never have been pioneered if the ships that crossed the ocean hadn't been reusable.

A battery by definition is a collection of cells. So the cell is a little can of chemicals. And the challenge is taking a very high-energy cell, and a large number of them, and combining them safely into a large battery.