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Across the world, people watch over a billion hours of video on YouTube every day. The sheer amount of video produced there is beyond comprehension. Every minute, over five hundred hours of footage are uploaded to the site, the equivalent of eighty-two years of video added a day. That anyone can easily access any minute of this footage–and the trillion minutes more already on YouTube–is a technical feat unmatched in the history of computing. Everyone knows YouTube. And yet virtually no one knows how it works.