When you buy a jacket, you pick the size to ensure it fits. Similarly, we live in a universe in which the amount of dark energy fits our biological make-up. If the amount of dark energy were substantially different from what we've measured, the environmental conditions would be inhospitable to our form of life.

Experimental evidence is the final arbiter of right and wrong.

Supersymmetry is a theory which stipulates that for every known particle there should be a partner particle. For instance, the electron should be paired with a supersymmetric 'selectron,' quarks ought to have 'squark' partners, and so on.

Intelligence is the ability to take in information from the world and to find patterns in that information that allow you to organize your perceptions and understand the external world.

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

I've seen children's eyes light up when I tell them about black holes and the Big Bang.

When I give this talk to a physics audience, I remove the quotes from my 'Theorem'.