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.

Evolution is not something you can believe in or not believe in like do you believe in gravity.

Science is the key to our future, and if you don't believe in science, then you're holding everybody back.

To leave the world better than you found it, sometimes you have to pick up other people's trash.

I hope climate science becomes the big thing. And then what I want is electrical engineers to solve the world's energy problems, energy distribution problems. I want mechanical engineers to make better transportation systems. I want chemical engineers to develop better solar panels, and so on.

If you meet somebody who says he or she has never dreamed of flying, I don't believe you. I mean, they're lying.

That's what makes a human a human, if we store information outside our bodies.