Google’s secret effort to scan every book in the world, codenamed “Project Ocean,” began in earnest in 2002 when Larry Page and Marissa Mayer sat down in the office together with a 300-page book and a metronome. Page wanted to know how long it would take to scan more than a hundred-million books, so he started with one that was lying around. Using the metronome to keep a steady pace, he and Mayer paged through the book cover-to-cover. It took them 40 minutes.

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