As my old professor Carl Sagan said so often, 'When you’re in love, you want to tell the world.’ And I base my beliefs on the information and the process that we call science. It fills me with joy to make discoveries every day of things I’ve never seen before. It fills me with joy to know that we can pursue these answers. It is an astonishing thing that we are — you and I are one of the ways the universe knows itself.

By the way, most of the light that comes from the sun is green.

Everyone you will ever meet knows something you don't.

The US Navy has several people on every ship that can navigate by the stars. They don't fool with that.

I'll admit that the discovery of evolution is humbling, but it is also empowering. It transforms our relationship to the life around us. Instead of being outsiders watching the natural world go by, we are insiders. We are part of the process; we are the exquisite result of billions of years of natural research and development.

One of the drawbacks of English is you can't spell things by hearing them.

Humor is everywhere in that there's irony in just about anything a human does.