"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."

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The rising sun managed to peek around the vast column of smoke that forever rose from Ankh-Morpork, City of Cities, illustrating almost up to the edge of space that smoke means progress or, at least, people setting fire to things.

— Terry Pratchett