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.

I wouldn't have thought that a wrong theory should lead us to understand better the ordinary quantum field theories or to have new insights about the quantum states of black holes.

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.

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.

In Einstein's general relativity the structure of space can change but not its topology. Topology is the property of something that doesn't change when you bend it or stretch it as long as you don't break anything.

Having those extra dimensions and therefore many ways the string can vibrate in many different directions turns out to be the key to being able to describe all the particles that we see.

As far as extra dimensions are concerned, very tiny extra dimensions wouldn't be perceived in everyday life, just as atoms aren't: we see many atoms together but we don't see atoms individually.

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.

Spreading out the particle into a string is a step in the direction of making everything we're familiar with fuzzy. You enter a completely new world where things aren't at all what you're used to.

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.

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.

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

On the other hand, we don't understand the theory too completely, and because of this fuzziness of spacetime, the very concept of spacetime and spacetime dimensions isn't precisely defined.

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.

It's indeed surprising that replacing the elementary particle with a string leads to such a big change in things. I'm tempted to say that it has to do with the fuzziness it introduces.

One of the basic things about a string is that it can vibrate in many different shapes or forms, which gives music its beauty.

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.

If I take the theory as we have it now, literally, I would conclude that extra dimensions really exist. They're part of nature. We don't really know how big they are yet, but we hope to explore that in various ways.

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.

The theory has to be interpreted that extra dimensions beyond the ordinary four dimensions the three spatial dimensions plus time are sufficiently small that they haven't been observed yet.

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 don't care about movies. I tend to play badminton once a week.

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.

I just think too many nice things have happened in string theory for it to be all wrong. Humans do not understand it very well, but I just don't believe there is a big cosmic conspiracy that created this incredible thing that has nothing to do with the real world.

I'm actually, for the most part, a complete agnostic politically.

If you are a researcher, you are trying to figure out what the question is as well as what the answer is.

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.

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.

Regardless of any deviations, it was clear I was supposed to end up in math and physics.

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

Androgyny is not trying to manage the relationship between the opposites; it is simply flowing between them.

We're all like children. We may think we grow up, but to me, being grown up is death, stopping thinking, trying to find out things, going on learning.

I am playing with the assumptions that we have in our everyday life when we are tripped up or fooled and we learn something, that makes things exciting - I am having fun with that stuff, but you have to manage it so it doesn't get too cute, that's what I trying to work toward.

'Thou shalt not get found out' is not one of God's commandments; and no man can be saved by trying to keep it.

Well, I think that those of us in public life that are trying to do a good job, and that are faced with this popular new game that the media has of being critical of everything that anybody in public office does probably are thin-skinned.

When Frank the Pug is singing I Will Survive, the only reason it's funny is that Will is in that shot trying not to get angry. A shot of a dog singing I Will Survive on its own will not get a laugh.

I sometimes lie awake at night trying to think of something funny that Richard Nixon said.

Votes are like trees, if you are trying to build a forest. If you have more trees than you have forests, then at that point the pollsters will probably say you will win.

I'd been trying for all of the eight years we'd been married to have a child, and finally I did.

Yeah; I'm a much better blues player than anybody knows, but being in the kind of group I'm in, we were always trying to make popular records.

Uhm, I'm the one wanting the lessons! I don't want to say too much about it because I'd rather have you see the movie, but he's trying to find his music.

So my idea of neurotic is spending too much time trying to correct a wrong. When I feel that I'm doing that, then I snap out of it.

I've always done food that can work in a set time frame. The message I'm trying to get across is, it doesn't have to take three days to do this. With planning, you can do a lot and really have quality food every day.

I meditate a lot, but I am constantly in pain. I'm trying to live with this. You just have to accept it.

I trained and trained and went up against Kurt, then being a world champion in '94, and after that I did Tommy's tour and then my tour and all this stuff and just trying to deal with it all. And now, I've just kind of backed off a little.

You feel the music needs something but you don't know what. So you start searching, fitting, measuring, trying. Every time you try another angle. And sometimes that's frustrating, especially if you don't come up with something for three days.

Trying to give back a little bit is important.

Intimacy comes from being yourself on the stage and making the audience feel, without trying, that you're sittin' down there with 'em, playing, and that can happen in a big hall, if you have a good audience that want to listen.

While advances in scientific research have led to some new and exciting treatments that have enlarged and enhanced the quality and length of human life, we must not lose sight as to what we are trying to accomplish.