My background educationally is physics and economics, and I grew up in sort of an engineering environment - my father is an electromechanical engineer. And so there were lots of engineery things around me.

I'm personally a moderate and a registered independent, so I'm not strongly Democratic or strongly Republican.

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.

It would take six months to get to Mars if you go there slowly, with optimal energy cost. Then it would take eighteen months for the planets to realign. Then it would take six months to get back, though I can see getting the travel time down to three months pretty quickly if America has the will.

My motivation for all my companies has been to be involved in something that I thought would have a significant impact on the world.

Great companies are built on great products.

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