Being a pessimist is just such a gloomy way of looking at things, so I have to hope for the best - life wouldn't be worth living if we didn't have hope. And I also do think that human beings often do do wonderful, correct, brilliant things. So, on balance, I'd like to be optimistic about the future.

I do find London exciting. Much as I hate to agree with that tedious old git Samuel Johnson, and despite the pompous imbecility of his famous remark about when a man is tired of London he is tired of life...I can't dispute it.

It is a slightly arresting notion that if you were to pick yourself apart with tweezers, one atom at a time, you would produce a mound of fine atomic dust, none of which had ever been alive but all of which had once been you.

If you believe in god, it's much more fantastic to believe that he created this universe billions of years ago and set in motion this long train of activities that eventually resulted in us. I think that's so much more satisfying, more thrilling, than the idea that it was all done in seven days.

So, if people didn’t settle down to take up farming, why then did they embark on this entirely new way of living? We have no idea – or actually, we have lots of ideas, but we don’t know if any of them are right. According to Felipe Fernández-Armesto, at least thirty-eight theories have been put forward to explain why people took to living in communities: that they were driven to it by climatic change, or by a wish to stay near their dead, or by a powerful desire to brew and drink beer, which could only be indulged by staying in one place.

On the dashboard of our family car is a shallow indentation about the size of a paperback book. If you are looking for somewhere to put your sunglasses or spare change, it is the obvious place, and it works extremely well, I must say, so long as the car is not actually moving. However, as soon as you put the car in motion ... everything slides off ... It can hold nothing that has not been nailed to it. So I ask you: what then is it for?

I can't imagine there has ever been a more gratifying time or place to be alive than America in the 1950s. No country had ever known such prosperity.