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

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 can be only a modest distance away from the gravity brane, and gravity will be incredibly weak.

I had this illusion that if I kind of dressed badly that I wouldn't stand out. You know, so I actually went out of my way to not look different to the extent I could.

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

I'm not creating the universe. I'm creating a model of the universe, which may or may not be true.

An almost indispensable skill for any creative person is the ability to pose the right questions. Creative people identify promising, exciting, and, most important, accessible routes to progress - and eventually formulate the questions correctly.