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"As of now, string theorists have no explanation of why there are three large dimensions as well as time, and the other dimensions are microscopic. Proposals about that have been all over the map."
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Exlpore more Time quotes

"We cannot measure time. We can only measure changes of life and the universe."

"I wouldn't ask too much of her,' I ventured. 'You can't change the past.''Can't change the past?' he cried incredulously. 'Why of course you can!"

"Wouldn't it be amazing if you could travel into the future, see where you messed up, and then go back in time to rearrange things in order to make your future better? You can. If you can foresee regret, you can mind-travel to the future. If you can train yourself to mind-travel effectively, you can intentionally affect your future by doing something about it today."

"A broad margin of leisure is as beautiful in a man's life as in a book. Haste makes waste, no less in life than in housekeeping. Keep the time, observe the hours of the universe, not of the cars."

"Eternity is a mere moment, just long enough for a joke."

"The value of time is immeasurable."

"Sometimes I feel like if you just watch things, just sit still and let the world exist in front of you - sometimes I swear that just for a second time freezes and the world pauses in its tilt. Just for a second. And if you somehow found a way to live in that second, then you would live forever."
Explore more quotes by Edward Witten

"As for the forces, electromagnetism and gravity we experience in everyday life. But the weak and strong forces are beyond our ordinary experience. So in physics, lots of the basic building blocks take 20th- or perhaps 21st-century equipment to explore."

"Even before string theory, especially as physics developed in the 20th century, it turned out that the equations that really work in describing nature with the most generality and the greatest simplicity are very elegant and subtle."

"You have that one basic string, but it can vibrate in many ways. But we're trying to get a lot of particles because experimental physicists have discovered a lot of particles."

"Quantum mechanics brought an unexpected fuzziness into physics because of quantum uncertainty, the Heisenberg uncertainty principle."

"Technically you need the extra dimensions. At first people didn't like them too much, but they've got a big benefit, which is that the ability of string theory to describe all the elementary particles and their forces along with gravity depends on using the extra dimensions."
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