Read the whole thing, but I thought this question and answer was probably my favorite part:

What are your thoughts about the despair some people feel when they ponder natural selection and random mutation? The idea of evolution and natural selection makes some people feel that everything is meaningless--people’s individual lives and life in general.

If it’s true that it causes people to feel despair, that’s tough. It’s still the truth. The universe doesn’t owe us condolence or consolation; it doesn’t owe us a nice warm feeling inside. If it’s true, it’s true, and you'd better live with it.

However, I don’t think it should make one feel depressed. I don’t feel depressed. I feel elated. My book, "Unweaving the Rainbow," is an attempt to elevate science to the level of poetry and to show how one can be—in a funny sort of way—rather spiritual about science. Not in a supernatural sense, but there are uplifting mysteries to be solved. The contemplation of the size and scale of the universe, of the depth of geological time, of the complexity of life--these all, to me, have an inspirational quality. It makes my life worthwhile to study them.

Good answer.