If what we regard as real depends on our theory, how can we make reality the basis of our philosophy? But we cannot distinguish what is real about the universe without a theory. It makes no sense to ask if it corresponds to reality, because we do not know what reality is independent of a theory.

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I have experimental evidence that time travel is not possible.

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The huge questions of existence still remain unanswered—how did life begin on Earth? What is consciousness? Is there anyone out there or are we alone in the universe? These are questions for the next generation to work on.

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We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special.

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Love the neighbor. But don't get caught.

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The wise never marry, and when they marry they become otherwise.

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Do you ever wonder how much deeper the ocean would be without sponges?

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Equations are just the boring part of mathematics. I attempt to see things in terms of geometry.

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contains on average some one hundred billion stars. If a star were a grain of salt, you could fit all the stars visible to the naked eye on a teaspoon, but all the stars in the universe would fill a ball more than eight miles wide.

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There is no unique picture of reality.

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