I have lived with the prospect of an early death for the last 49 years. I'm not afraid of death, but I'm in no hurry to die. I have so much I want to do first. I regard the brain as a computer which will stop working when its components fail. There is no heaven or afterlife for broken down computers; that is a fairy story for people afraid of the dark.

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

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It is very important for young people keep their sense of wonder and keep asking why.

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If at first you don't succeed, try management.

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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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You can’t get to a time before the Big Bang because there was no time before the Big Bang. We have finally found something that doesn’t have a cause, because there was no time for a cause to exist in.

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

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People won't have time for you if you are always angry or complaining.

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I've noticed that even people who believe in fate look both ways before crossing the street.

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I think the human race has no future if it doesn't go into space.

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