Some people don't like change, but you need to embrace change if the alternative is disaster.

When Henry Ford made cheap, reliable cars people said, 'Nah, what's wrong with a horse?' That was a huge bet he made, and it worked.

It is definitely true that the fundamental enabling technology for electric cars is lithium-ion as a cell chemistry technology. In the absence of that, I don't think it's possible to make an electric car that is competitive with a gasoline car.

I think the high-tech industry is used to developing new things very quickly. It's the Silicon Valley way of doing business: You either move very quickly and you work hard to improve your product technology, or you get destroyed by some other company.

We need to figure out how to have the things we love, and not destroy the world.

I realized that a methane-oxygen rocket engine could achieve a specific impulse greater than 380.

People work better when they know what the goal is and why. It is important that people look forward to coming to work in the morning and enjoy working.