After a year I applied... in fact, it's the only job I've ever applied for and I didn't get it. So I... I applied to go to Makerere College, and the reason I wanted to go abroad was because my residential scholarship was for four years and so for my last year I had to borrow money. And so here I was on a pittance of a salary and big debts, and just got married, and I knew I couldn't live with this so I had to emigrate, and so I tried to go to Uganda, failed, but they offered me a job in Singapore, so that's where I went. So for three years I was in Singapore earning enough money to pay off my debts. And, incidentally, this is one reason why I'm so passionately against young people being saddled with debt, as they are today, at the start of their careers. I think it's just abominable. Anyway, a bit of politics. In Singapore I learned to teach more. It's quite interesting, you start off... it's a polyglot community; mainly Chinese, but there are Indians of various types, and there's Malays of course. And, you start off and everybody is vaguely browner than you are, and then you gradually learn to recognise the Chinese and the Tamils and the Sikhs and Malays and so on, and you're aware of the differences. And then, after about a year, you don't notice them anymore, or you notice all the ones you like and the ones you don't like, so you become sort of colour blind, which I found an interesting experience, in retrospect. And, incidentally, I was teaching these youngsters, medical students, and I was trying to teach them human physiology by making them do experiments on themselves. Now, you were talking a moment ago about passing a nasogastric tube to...so one of the experiments I did was to get the students to pass a tube on each other or on themselves so that they could sample the gastric secretion and so on, and it was fascinating. The Chinese could just... no problems. All the others – the Indians, the Malays: they gagged and choked. It was a clear difference between them. I did research and I lost my way. I became so obsessed with trying... what I was trying to do was measure, or find out, whether viscosity changes in the blood depending on whether the gut was absorbing water – fluid – or secreting, and so I thought I could detect this if I measured pressure flow relations. And so I got absorbed in all the engineering and the maths, and I completely and utterly... the whole thing was far away beyond my skill or capacity. So what I did learn there was not how to do research but how not to do it, and I learned, I think, the most important lesson of my life which is: in research it is impossible to make an experiment too simple and that, really, what you have to do is take a problem and see if you can break it down to smaller problems. And, if you get a problem, you know this... that... that's almost moronically simple, it seems hardly worth asking, the only thing you don't know is the answer, but you know it's a question which is answerable, and then you've got yourself an experiment.