Facts are true whether or not you believe them.

I'd like to live in a world where people embrace objective truths rather than be offended by them.

To the scientist, the universality of physical laws makes the cosmos a marvelously simple place. By comparison, human nature-the psychologist's domain-is infinitely more daunting.

I believe that the manned space program can engage the public by advancing the space frontier. Every next mission takes you farther out in space than you were before, either technologically or in terms of distance.

We are part of this universe; we are in this universe, but perhaps more important than both of those facts, is that the universe is in us.

Some claim evolution is just a theory. As if it were merely an opinion. The theory of evolution, like the theory of gravity, is a scientific fact. Evolution really happened. Accepting our kinship with all life on Earth is not only solid science. In my view, it’s also a soaring spiritual experience.

I don't have an issue with what you do in the church but I'm going to be up in your face if you're going to knock on my science classroom and tell me I got to teach what you're teaching in your Sunday school. That's when we're going to fight... There's no tradition of scientists knocking down the Sunday school door, telling the preacher 'that might not necessarily be true.' That's never happened. There are no scientists picketing out front of churches. There's been this coexistence forever, so to have religious communities knocking down the science door, there's something wrong there.