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.

You have to be careful when you use beauty as a guide. There are many theories people didn't think were beautiful at the time but did find beautiful later—and vice versa. I think simplicity is a good guide: The more economical a theory, the better.

We certainly don't yet know all the answers. But the universe is about to be pried open.

When it comes to the world around us, is there any choice but to explore?

There is real confusion about what it means to be right and wrong - the difference between what spiritual beliefs are and what science is.

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.