Go the extra mile. It makes your boss look like an incompetent slacker.

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The twentieth century saw man's view of the universe transformed: we realized the insignificance of our planet in the vastness of the universe, and we discovered that time and space we curved and inseparable , that the universe was expanding, and that it had a beginning in time.

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Unfortunately, however, these two theories are known to be inconsistent with each other—they cannot both be correct.

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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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Although I cannot move, and I have to speak through a computer, in my mind, I am free.

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This means that at earlier times objects would have been closer together. In fact, it seemed that there was a time, about ten or twenty thousand million years ago, when they were all at exactly the same place and when, therefore, the density of the universe was infinite.

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When something is made idiot proof, they will just make better idiots.

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Disability need not be an obstacle to success.

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[If] there were such a God, I would like to ask however did he think of anything as complicated as M-theory in eleven dimensions.

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We are all now connected by the Internet, like neurons in a giant brain.

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