The three rules of the Librarians of Time and Space are: 1) Silence; 2) Books must be returned by no later than the date shown; and 3) Do not interfere with the nature of causality.

Particles of raw inspiration sleet through the universe all the time. Every once in a while one of them hits a receptive mind, which then invents DNA or the flute sonata form or a way of making light bulbs wear out in half the time. But most of them miss. Most people go through their lives without being hit by even one.

Cake is not the issue here.

However, you do need rules. Driving on the left (or the right or, in parts of Europe, on the left and the right as the mood takes you) is a rule which works, since following it means you're more likely to reach your intended rather than your final destination.

Nanny's philosophy of life was to do what seemed like a good idea at the time, and do it as hard as possible. It had never let her down.

You just put that sword away, sir, please," said the voice of Lance-Constable Vimes. "You will not shoot me, you young idiot. That would be murder," said the captain calmly. "Not where I'm aiming, sir.

There are plenty of people who believe that Elvis is alive, or that aliens occasionally land here to do highly personal things to people, or that the whole idea of evolution is a conspiracy of godless scientists. Almost all of these people can vote and some of them have got guns.