Some people try to tell me that science will never answer the big questions we have in life. To them I say: baloney! The real problem is your questions aren't big enough.

A lot of them complain because they say the word denial puts them in the same bin as holocaust deniers. That's too bad. But the thing is, they do have something in common: a denial of evidence and of scientific consensus.

It’s dead obvious that creationism isn’t science, or even bad science. It’s nonsense. But I’ve long stated it’s also bad religion, because it doesn’t just take faith, it also takes a phenomenal disregard of reality.

If a little kid ever asks you just why the sky is blue, you look him or her right in the eye and say, 'It's because of quantum effects involving Rayleigh scattering combined with a lack of violet photon receptors in our retinae.'

When you're dealing with the universe, ignorance can be deadly.

Humanity and life are reflected in the stars, and the Universe itself is poetry.

Sixty-five million years ago the dinosaurs had a bad day.