Doctor Who has never pretended to be hard science fiction... At best Doctor Who is a fairytale, with fairytale logic about this wonderful man in this big blue box who at the beginning of every story lands somewhere where there is a problem...

It used to be thought that the events that changed the world were things like big bombs, maniac politicians, huge earthquakes, or vast population movements, but it has now been realized that this is a very old-fashioned view held by people totally out of touch with modern thought. The things that really change the world, according to Chaos theory, are the tiny things. A butterfly flaps its wings in the Amazonian jungle, and subsequently a storm ravages half of Europe.

You know what my mum once said?’ said Rosie… ‘She said that if a just-married couple put a coin in a jar every time they make love in their first year, and take a coin out for every time that they make love in the years that follow, the jar will never be emptied.’ And this means…?’ Well’, she said. ‘It’s interesting, isn’t it?

Night was spreading slowly around the spinning Earth. It should have been full of pinpricks of light. It was not. There were five billion people down there. What was going to happen soon would make barbarism look like a picnic - hot, nasty, and eventually given over to the ants.

Great, big, serious novels always get awards. If it's a battle between a great, big, serious novel and a funny novel, the funny novel is doomed.

I watch with envious eyes and mind, the single-souled who dare not feel The wind that blows beyond the moon, who do not hear the fairy reel

One thing I've learned: you can know anything, it's all there, you just have to find it.