There are perfectly good independent small nations.

Climate change will affect the whole of humanity, while terrorist attacks will only affect a small section of humanity. Of course, you wouldn't say that if you were related to someone who had been beheaded or blown up or murdered. But humanity is facing a very big, slow, long, drawn-out threat, and that is to do with the way the weather is changing and the size of the population.

If I can make programmes when I'm 95, that would be fine. But I would think I'll have had enough by then.

This last chapter .. may have given the impression that somehow man is the ultimate triumph of evolution, that all these millions of years of development have had no purpose other than to put him on earth. There is no scientific evidence whatever to support such a view and no reason to suppose that our stay here will be any more permanent than that of the dinosaur.

I think the most alarming animals I have encountered are really poisonous snakes.

I think a major element of jetlag is psychological. Nobody ever tells me what time it is at home.

I believe the Abominable Snowman may be real. I think there may be something in that.