The light works," he said, indicating the window, "the gravity works," he said, dropping a pencil on the floor. "Anything else we have to take our chances with.

[The Head of Radio Three] had been ensnared by the Music Director of the college and a Professor of Philosophy. These two were busy explaining to the harassed man that the phrase "too much Mozart" was, given any reasonable definition of those three words, an inherently self-contradictory expression, and that any sentence which contained such a phrase would be thereby rendered meaningless and could not, consequently, be advanced as part of an argument in favour of any given programme-scheduling strategy.

The invention of the scientific method and science is, I'm sure we'll all agree, the most powerful intellectual idea, the most powerful framework for thinking and investigating and understanding and challenging the world around us that there is, and it rests on the premise that any idea is there to be attacked. If it withstands the attack then it lives to fight another day and if it doesn't withstand the attack then down it goes. Religion doesn't seem to work like that.

What I mean is that if you really want to understand something, the best way is to try and explain it to someone else. That forces you to sort it out in your mind. And the more slow and dim-witted your pupil, the more you have to break things down into more and more simple ideas. And that's really the essence of programming. By the time you've sorted out a complicated idea into little steps that even a stupid machine can deal with, you've learned something about it yourself... The teacher usually learns more than the pupils. Isn't that true?

Ghastly," continued Marvin, "it all is. Absolutely ghastly. Just don't even talk about it. Look at this door," he said, stepping through it. The irony circuits cut in to his voice modulator as he mimicked the style of the sales brochure. " 'All the doors in his spaceship have a cheerful and sunny disposition. It is their pleasure to open for you, and their satisfaction to close again with the knowledge of a job well done.' " As the door closed behind them it became apparent that it did indeed have a satisfied sighlike quality to it. "Hummmmmmmyummmmmmmah!" it said.

We talked about how easy it was to make the mistake of anthropomorphizing animals, and projecting our own feelings and perceptions on to them, where they were inappropriate and didn't fit. We simply had no idea what it was like being an extremely large lizard, and neither for that matter did the lizard, because it was not self-conscious about being an extremely large lizard, it just got on with the business of being one. To react with revulsion to its behavior was to make the mistake of applying criteria that are only appropriate to the business of being human.

Numbers written on restaurant bills within the confines of restaurants do not follow the same mathematical laws as numbers written on any other pieces of paper in any other parts of the Universe. This single fact took the scientific world by storm.