Our only chance of long-term survival is not to remain lurking on planet Earth, but to spread out into space.

We see the universe the way it is because we exist.

I don't want to write an autobiography because I would become public property with no privacy left.

We should seek the greatest value of our action.

The moment you understand the whole Universe, is the moment you slightly begin to understand the way God's mind works

Using e-mail, I can communicate with scientists all over the world.

While physics and mathematics may tell us how the universe began, they are not much use in predicting human behavior because there are far too many equations to solve. I'm no better than anyone else at understanding what makes people tick, particularly women.