America is a great disappointment to me. As I said in one of my books, other societies create civilisations; we build shopping malls.

As my father always used to tell me, 'You see, son, there's always someone in the world worse off than you.' And I always used to think, 'So?

The food is excellent. The beer is cold. The sun nearly always shines. There is coffee on every corner. Life doesn’t get much better than this.

It's hard not to be kind of pessimistic about human beings generally, because we do tend to mess things up. If you just look at the history of extinctions, we've killed off an awful lot of animals - and I don't think we're doing a very good job of looking after the planet.

So here I am, my affections torn between a postal service that never feeds me but can tackle a challenge and one that gives me free tape and prompt service but won't help me out when I can't remember a street name. The lesson to draw from this, of course, is that when you move from one country to another you have to accept that there are some things that are better and some things worse, and there is nothing you can do about it. That may not be the profoundest of insights to take away from a morning's outing, but I did get a free doughnut as well, so on balance I guess I'm happy.

Think of a single problem confronting the world today. Disease, poverty, global warming... If the problem is going to be solved, it is science that is going to solve it. Scientists tend to be unappreciated in the world at large, but you can hardly overstate the importance of the work they do. If anyone ever cures cancer, it will be a guy with a science degree. Or a woman with a science degree.

In terms of adaptability, humans are pretty amazingly useless.