People sometimes try to score debating points by saying, Evolution is only a theory. That is correct, but it's important to understand what that means. It is also only a theory that the world goes round the Sun - it's just a theory for which there is an immense amount of evidence. There are many scientific theories that are in doubt. Even within evolution, there is some room for controversy. But that we are cousins of apes and jackals and starfish, let's say, that is a fact in the ordinary sense of the word.

The word 'mundane' has come to mean 'boring' and 'dull', and it really shouldn't - it should mean the opposite. Because it comes from the latin mundus, meaning 'the world'. And the world is anything but dull: The world is wonderful. There's real poetry in the real world. Science is the poetry of reality.

Being dead will be no different from being unborn -- I shall be just as I was in the time of William the Conqueror or the dinosaurs or the trilobites. There is nothing to fear in that.

The solution often turns out more beautiful than the puzzle.

Imagine a crime series in which, every week, there is a white suspect and a black suspect. And every week, lo and behold, the black one turns out to have done it. Unpardonable, of course. And my point is that you could not defend it by saying: "But it's only fiction, only entertainment."

It really comes down to parsimony, economy of explanation. It is possible that your car engine is driven by psychokinetic energy, but if it looks like a petrol engine, smells like a petrol engine and performs exactly as well as a petrol engine, the sensible working hypothesis is that it is a petrol engine.

All religious beliefs seem weird to people not brought up in them.