There are so many adventures that you miss because you're waiting to think of a plan. To find them, look for tiny interesting choices. And remember that you are always making up the future as you go.

If at first you don't succeed, that's one data point.

I never trust anyone who's more excited about success than about doing the thing they want to be successful at.

The universe is probably littered with the one-planet graves of cultures which made the sensible economic decision that there's no good reason to go into space-each discovered, studied, and remembered by the ones who made the irrational decision.

Our brains have just one scale, and we resize our experiences to fit.

I think the really cool and compelling thing about math and physics is that it opens up entry to all these hypotheticals - or at least, it gives you the language to talk about them. But at the same time, if a scenario is completely disconnected from reality, it's not all that interesting.

Space is about 100 kilometers away. That’s far away—I wouldn’t want to climb a ladder to get there—but it isn’t that far away. If you’re in Sacramento, Seattle, Canberra, Kolkata, Hyderabad, Phnom Penh, Cairo, Beijing, central Japan, central Sri Lanka, or Portland, space is closer than the sea.