No I don't ever give up. I would have to be dead or completely incapacitated

The fuel cell is just a fundamentally inferior way of delivering electrical energy to an electric motor than batteries.

I think it's very important to have a feedback loop, where you're constantly thinking about what you've done and how you could be doing it better.

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's not as though we can keep burning coal in our power plants. Coal is a finite resource, too. We must find alternatives, and it's a better idea to find alternatives sooner then wait until we run out of coal, and in the meantime, put God knows how many trillions of tons of CO2 that used to be buried underground into the atmosphere.

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.

The extension of life beyond Earth is the most important thing we can do as a species.