If you're co-founder or CEO, you have to do all kinds of tasks you might not want to do. If you don't do your chores, the company won't succeed. No task is too menial.

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

I do love email. Wherever possible I try to communicate asynchronously. I'm really good at email.

I've actually made a prediction that within 30 years a majority of new cars made in the United States will be electric. And I don't mean hybrid, I mean fully electric.

Life is too short for long-term grudges.

Silicon Valley has some of the smartest engineers and technology business people in the world.

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