"There's a saying that all roads lead to Ankh-Morpork. And it's wrong. All roads lead away from Ankh-Morpork, but sometimes people just walk along them the wrong way."
"Cats will amusingly tolerate humans only until someone comes up with a tin opener that can be operated with a paw."
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Source: Ian Stewart, Jack Cohen, Terry Pratchett (2011). “The Science Of Discworld Revised Edition”, p.185, Random House
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