90% of the mass in your body comes from empty space.

Whatever the evolutionary basis of religion, the xenophobia it now generates is clearly maladaptive.

There are a lot of legislators who are afraid that kids will learn science and lose their faith.

A truly open mind means forcing our imaginations to conform to the evidence of reality, and not vice versa.

We now know that we are more insignificant than we ever imagined. If you get rid of everything we see, the universe is essentially the same. We constitute a 1 percent bit of pollution in a universe . . . we are completely irrelevant.

The one experience that I hope every student has at some point in their lives is to have some belief you profoundly, deeply hold, proved to be wrong because that is the most eye-opening experience you can have, and as a scientist, to me, is the most exciting experience I can ever have.

Neutrinos alone, among all the known particles, have ethereal properties that are striking and romantic enough both to have inspired a poem by John Updike and to have sent teams of scientists deep underground for 50 years to build huge science-fiction-like contraptions to unravel their mysteries.