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.

It's a fixer-upper of a planet but we could make it work.

The idea of lying on a beach as my main thing just sounds like the worst. It sounds horrible to me. I would go bonkers. I would have to be on serious drugs. I'd be super-duper bored. I like high intensity.

I think we should be very careful about artificial intelligence. If I had to guess at what our biggest existential threat is, it's probably that. So we need to be very careful...With artificial intelligence we're summoning the demon.

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

So, there's quite a big keep-out zone, and when you factor the keep-out zone into account, the solar panels put on that area would typically generate more power than that nuclear power plant.

Great companies are built on great products.