Talk about science with everyone you meet. Especially talk about climate change. It needs to become a part of our everyday conversation (the way it is everywhere else in the world).

The meaning of life is pretty clear: Living things strive to pass their genes into the future. The claim that we would not have morals or ethics without religion is extraordinary. Animals in nature seem to behave in moral ways without organized religion.

I say to the grown-ups, 'If you want to deny evolution and live in your world that's completely inconsistent with everything we've observed in the universe that's fine. But don't make your kids do it.'

The debate [in Undeniable] was nominally about creationism as a "viable" explanation for what we observe around us. For my side, the debate went very well; I'm not sure what I would change, although I can imagine shortening my answers during the rebuttals, perhaps.

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

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.

I am so old, I entered engineering school with a slide rule. And I left engineering school with a calculator. I can still use a slide rule but it's not a skill you especially need anymore.