Many things are improbable, only a few are impossible.

If you had to buy a new plane every time you flew somewhere, it would be incredibly expensive.

I think that's the single best piece of advice: constantly think about how you could be doing things better and questioning yourself.

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

What I'm trying to do is, is to make a significant difference in space flight. And help make space flight accessible to almost anyone.

I'm a Silicon Valley guy. I just think people from Silicon Valley can do anything.

Entrepreneurship is like eating glass and walking on hot coals at the same time