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

Both religions and musicals work best with energetic and committed believers. Cynicism or detachment would have destroyed the magic - something true of religion, too.

Travel at faster than the speed of light certainly can have dramatic implications that are difficult to understand, such as time travel.

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.

Science is a combination of theory and experiment and the two together are how you make progress.

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

Secrets of the cosmos will begin to unravel. I, for one, can't wait.