I did stand-up comedy for 18 years. Ten of those years were spent learning, four years were spent refining, and four years were spent in wild success. I was seeking comic originality, and fame fell on me as a byproduct. The course was more plodding than heroic.

The banjo is truly an American instrument, and it captures something about our past.

I just believe that the interesting time in a career is pre-success, what shaped things, how did you get to this point.

I never thought about success. I always thought about doing the job at hand. My goal was getting through the show that night.

My main interest is the problem of the singularity. If we can't understand what happened at the singularity we came out of, then we don't seem to have any understanding of the laws of particle physics. I'd be very happy just to understand the last singularity and leave the other ones to future generations.

The question that I started off with was, I thought, very simple. It was just 'Is there a massive black hole at the center of the Milky Way?' But one of the things I love about science is that you always end up with new questions.

The OECD should respond directly to the specific needs of the member countries. You basically say, 'What works?' You don't have to go on a discovery trip. It's all there; you just call them, and they know. It's like a knowledge bank.

If a band is really good and the chemistry is unique, it should continue. But I guess David is just very happy doing his solo career. He's got a different band every time he goes out.