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.

If humanity doesn't land on Mars in my lifetime, I would be very disappointed.

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.

Weighing too much on someone's talent and not someone's personality. I think it matters whether someone has a good heart.

Facebook is quite entrenched and has a network effect. It's hard to break into a network once it's formed.

There's a tremendous bias against taking risks. Everyone is trying to optimize their ass-covering.

I'm reasonably optimistic about the future, especially the future of the United States - for the century, at least.