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.

There was a long history of speculation that in quantum gravity, unlike Einstein's classical theory, it might be possible for the topology of spacetime to change.

There is a difference between knowing what is true and knowing why it is true

We know a lot of things, but what we don't know is a lot more.

I have a tendency, more than most other physicists, to try to figure out everything all at once, before I publish. And even to try to figure out everything in my head, without pencil and paper.

Im actually, for the most part, a complete agnostic politically.

So when you ask me how string theory might be tested, I can tell you what's likely to happen at accelerators or some parts of the theory that are likely to be tested.

I have a much easier time imagining how we would understand the big bang, even though we can't do it yet, than I can imagine understanding consciousness.

One very important aspect of string theory is definitely testable. That was the prediction of supersymmetry, which emerged from string theory in the early '70s.

String theory is an attempt at a deeper description of nature by thinking of an elementary particle not as a little point but as a little loop of vibrating string.

M stands for Magic, Mystery, or Matrixaccording to taste

Without fear there cannot be courage.

Silence is what causes most of humanities problems.

There is so much more to marriage than who makes the money. Some of the hardest parts don't come with a paycheck.

Patience wins the race.

Everybody likes to go their own way–to choose their own time and manner of devotion.

God is thy law, thou mine.

Without glasnost there is not, and there cannot be, democratism, the political creativity of the masses and their participation in management.

One should never spurn a penitent criminal: in his despair he may become twice as much a criminal as before.

When people are financially invested, they want a return. When people are emotionally invested, they want to contribute.

I don't write tracts, I write novels. I'm not a preacher, I'm a fiction writer.