I would see the end of physics as we know it, but now I think the wonder of discovery will continue long after I am gone. We are close to some of these answers, but we are not there yet.

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Intelligence is the ability to adapt to change.

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We are very, very small, but we are profoundly capable of very, very big things.

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Quiet people have the loudest minds.

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So remember to look up at the stars and not down at your feet. Try to make sense of what you see and hold on to that childlike wonder about what makes the universe exist.

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The thing about smart people is that they seem like crazy people to dumb people.

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We are in danger of destroying ourselves by our greed and stupidity. We cannot remain looking inwards at ourselves on a small and increasingly polluted and overcrowded planet.

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We spend a great deal of time studying history, which, let’s face it, is mostly the history of stupidity. So

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The idea that we are alone in the universe seems to me completely implausible and arrogant, considering the number of planets and stars that we know exist, it's extremely unlikely that we are the only form of evolved life.

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The laws of physics demand the existence of something called ‘negative energy’.

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