From the days of Sumerian clay tablets until now, humans have “published” at least 310 million books, 1.4 billion articles and essays, 180 million songs, 3.5 trillion images, 330,000 movies, 1 billion hours of videos, TV shows, and short films, and 60 trillion public web pages. All this material is currently contained in all the libraries and archives of the world. When fully digitized, the whole lot could be compressed (at current technological rates) onto 50-petabyte hard disks. Ten years ago you needed a building about the size of a small-town library to house 50 petabytes. Today the
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