“Quantum mechanics brought an unexpected fuzziness into physics because...” — Edward Witten Quote

Quantum mechanics brought an unexpected fuzziness into physics because of quantum uncertainty, the Heisenberg uncertainty principle. String theory does so again because a point particle is replaced by a string, which is more spread out.

But the beauty of Einstein's equations, for example, is just as real to anyone who's experienced it as the beauty of music. We've learned in the 20th century that the equations that work have inner harmony.

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.

As racing drivers, you always have those moments that it gets a bit heated, but then you start from zero again.

For me, I believe George Foreman was a bad example because when he became world heavyweight champion again at 42, that made a lot of fighters think they could also carry on.

You know those little snow globes that you shake up? I always thought my brain was sort of like that. You know, where you just give it a shake and watch what comes out and shake it again. It's like that.

To fail is a natural consequence of trying, To succeed takes time and prolonged effort in the face of unfriendly odds. To think it will be any other way, no matter what you do, is to invite yourself to be hurt and to limit your enthusiasm for trying again.