Evolution is the fundamental idea in all of life science, in all of biology. It’s like, it’s very much analogous to trying to do geology without believing in tectonic plates. You’re just not going to get the right answer. Your whole world is just going to be a mystery instead of an exciting place.

As my old professor, Carl Sagan, said, “When you’re in love you want to tell the world.” So, once in a while I get people that really—or that claim—they don’t believe in evolution. And my response generally is “Well, why not? Really, why not?” Your world just becomes fantastically complicated when you don’t believe in evolution. I mean, here are these ancient dinosaur bones or fossils, here is radioactivity, here are distant stars that are just like our star but they’re at a different point in their lifecycle. The idea of deep time, of this billions of years, explains so much of the world around us. If you try to ignore that, your world view just becomes crazy, just untenable, itself inconsistent.