Seeing, Contrary To Popular Wisdom, Isn't Believing.

Granddad Was Superstitious About Books. He Thought That If You Had Enough Of Them Around, Education Leaked Out, Like Radioactivity.

People Are Bound To Get Excited When They See A Ten-million-ton Starship Trying To Fly Down The Street.

He Moved On, In The Centre Of A Widening Circle. He Wasn't An Enemy, He Was A Nemesis.

And Sam Vimes Thought: Why Is Young Sam's Nursery Full Of Farmyard Animals Anyway? Why Are His Books Full Of Moo-cows And Baa-lambs? He Is Growing Up In The City. He Will Only See Them On A Plate! They Go Sizzle!

That's Why It's Always Worth Having A Few Philosophers Around The Place. One Minute It's All Is Truth Beauty And Is Beauty Truth, And Does A Falling Tree In The Forest Make A Sound If There's No One There To Hear It, And Then Just When You Think They're Going To Start Dribbling One Of 'em Says, Incidentally, Putting A Thirty-foot Parabolic Reflector On A High Place To Shoot The Rays Of The Sun At An Enemy's Ships Would Be A Very Interesting Demonstration Of Optical Principles.