Actively seek out and listen carefully to negative feedback.

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

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

There have only been about a half dozen genuinely important events in the four-billion-year saga of life on Earth: single-celled life, multicelled life, differentiation into plants and animals, movement of animals from water to land, and the advent of mammals and consciousness.

I feel very strongly that SpaceX would not have been able to get started, nor would we have made the progress that we have, without the help of NASA.

The tough thing is figuring out what questions to ask, but […] once you do that, the rest is really easy.

With artificial intelligence, we are summoning the demon. In all those stories where there's the guy with the pentagram and the holy water, it's like, yeah, he's sure he can control the demon. Didn't work out.