Although I was first drawn to math and science by the certainty they promised, today I find the unanswered questions and the unexpected connections at least as attractive.

Maybe dark matter is denser than we usually assume, kind of like the Milky Way plane.

There are many aspects of time we just do not understand. That’s the thing about writing a popular book: You realize the things you understand because for those you can give a really simple explanation. But some things about time I just don’t know how to give simple explanations for, even though I can tell you mathematically what’s going on.

Scientists actively approach the door to knowledge—the boundary of the domain of what we know. We question and explore and we change our views when facts and logic force us to do so. We are confident only in what we can verify through experiments or in what we can deduce from experimentally confirmed hypotheses.

It's hubris to think that the way we see things is everything there is.

Probably if you look like Tyra Banks, it probably is hard, even if you are really smart, for people to take - it surprises some.

When I was in school I liked math because all the problems had answers. Everything else seemed very subjective.