Physics grapples with the largest questions the universe presents. Where did the totality of reality come from? Did time have a beginning?

My emotional investment is in finding truth. If string theory is wrong, I'd like to have known that yesterday. But if we can show it today or tomorrow, fantastic.

Our eyes only see the big dimensions, but beyond those there are others that escape detection because they are so small.

When you know the answer you want, it is often all too easy to figure out a way of getting it.

There may be many Big Bangs that happened at various and far-flung locations, each creating its own swelling, spatial expanse, each creating a universe - our universe being the result of only one of those Big Bangs.

The number of e-mails and letters that I get from choreographers, from sculptors, from composers who are being inspired by science is huge.

Relativity challenges your basic intuitions that you've built up from everyday experience. It says your experience of time is not what you think it is, that time is malleable. Your experience of space is not what you think it is; it can stretch and shrink.