And what do you really do? asked Tiffany. The thin witch hesitatied for a moment, and then: We look to ... the edges, said Mistress Weatherwax. There's a lot of edges, more than people know. Between life and death, this world and the next, night and day, right and wrong ... an' they need watchin'. We watch 'em, we guard the sum of things. And we never ask for any reward. That's important.
And therefore education at the University mostly worked by the age-old method of putting a lot of young people in the vicinity of a lot of books and hoping that something would pass from one to the other, while the actual young people put themselves in the vicinity of inns and taverns for exactly the same reason.
Gnomes live ten times faster than humans. They're harder to see than a high-speed mouse. That's one reason why most humans hardly ever see them. The other is that humans are very good at not seeing things they know aren't there. And, since sensible humans know that there are no such things as people four inches high, a gnome who doesn't want to be seen probably won't be seen... Wings.
Magicians and scientists are, on the face of it, poles apart. Certainly, a group of people who often dress strangely, live in a world of their own, speak a specialized language and frequently make statements that appear to be in flagrant breach of common sense have nothing in common with a group of people who often dress strangely, speak a specialized language, live in ... er ...
The thing about secrets is that they are usually best kept by just one person. That was the special thing about secrets. Some people seemed to think that the best way to keep a secret was to tell as many people as possible; what could possibly go wrong for a secret when there were so many people defending it?