I now don’t do experiments. I haven’t done an experiment in a year and in the few years before that I was doing relatively few experiments. But up until I guess five, six, seven years ago I was doing a lot of experiments and I enjoyed doing experiments, partly because doing the experiments is actually a very good way of thinking about what you’re doing. I… I think best really when I’m doing it, or talking to somebody and bouncing ideas around. I don’t think that well under a tree, or in a bathtub, or waiting for a bus. I think better when talking to somebody, or doing experiments was actually a great stimulator of thinking for me.

So I… I actually liked doing the experiments and I liked thinking about them while I’m doing them, and you’re sort of closer to what you’re doing so I liked that. But now I actually, rarely get a chance to do experiments because in order to do experiments usefully it can’t be interrupted, you have to be able to spend weeks at a time, and since I travel so much I’m not here for more than a week or two at any one stretch, so it’s very hard. That’s why I don’t do it.