Physics is really figuring out how to discover new things that are counterintuitive, like quantum mechanics. It's really counterintuitive.

Patience is a virtue, and I'm learning patience. It's a tough lesson.

You need to be in the position where it is the cost of the fuel that actually matters and not the cost of building the rocket in the first place.

You need to live in a dome initially but over time you could terraform Mars to look like Earth and eventually walk around outside without anything on. ... So it's a fixer-upper of a planet.

My mentality is that of a samurai. I would rather commit seppuku than fail.

For me it was never about money, but solving problems for the future of humanity.

We're running the most dangerous experiment in history right now, which is to see how much carbon dioxide the atmosphere can handle before there is an environmental catastrophe.