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Tom Scott visits the historic Chained Library at Hereford Cathedral to explore the medieval technology of chaining books to shelves for security—a system used to protect valuable manuscripts before the printing press revolutionized knowledge access. The video explains how this once-cutting-edge technology for preserving and controlling access to manuscripts gave way to later innovations like the printing press that democratized knowledge. Suitable for anyone curious about library history, the evolution of information technology, or English heritage.