When students cheat on exams, it's because our school system values grades more than students value learning.

God is an ever-receding pocket of scientific ignorance that's getting smaller and smaller and smaller as time moves on.

I love being wrong because that means in that instant, I learned something new that day.

The best educators are the ones that inspire their students. That inspiration comes from a passion that teachers have for the subject they're teaching. Most commonly, that person spent their lives studying that subject, and they bring an infectious enthusiasm to the audience.

Let us not fool ourselves into thinking we went to the Moon because we are pioneers, or discoverers, or adventurers. We went to the Moon because it was the militaristically expedient thing to do.

I'd rather enjoy the money, and then be buried, offering my body back to the flora and fauna of which I have dined my whole life.

We account for all the matter and energy that we're familiar with, measure up how much gravity it should have, it's one-sixth of the gravity that's actually operating on the universe. We call that dark matter. It really should be called dark gravity. We don't know what that is.