The greatest teachers are the ones that turn a B student into an A student, or a failing student into a B student.

I'm often asked whether I believe in Global Warming. I now just reply with the question: "Do you believe in Gravity?"

I don't want to die ... I don't want to die poor. Two great motivators in the history of human cultures.

The atoms of our bodies are traceable to stars that manufactured them in their cores and exploded these enriched ingredients across our galaxy, billions of years ago. For this reason, we are biologically connected to every other living thing in the world. We are chemically connected to all molecules on Earth. And we are atomically connected to all atoms in the universe. We are not figuratively, but literally stardust.

Countless women are alive today because of ideas stimulated by a design flaw in the Hubble Space Telescope.

People say, oh we just need charismatic leaders to continue on to Mars. Now we've gone to the moon, of course Mars is next. No. Mars was never, of course, next. It is next if you think we went to the moon because we're explorers, but if you know we went to the moon because we were at war then we're never going to Mars. There's no military reason to do it, to justify the expenditure.

I am not the most annoying person to bring to a movie 'cause I basically hold it in and write about it later or tweet about it. The most annoying people to bring to movies, I think we all agree, are those who read the book first.