“Wales started with a few dozen prewritten articles and a software application called a Wiki (named for the Hawaiian word meaning “quick” or “fast”), which allows anybody with Web access to go to a site and edit, delete, or add to what’s there. The ambition: Nothing less than to construct a repository of knowledge to rival the ancient library of Alexandria. This was, needless to say, controversial. For one thing, this is not how encyclopedias are supposed to be made. From the beginning, compiling authoritative knowledge has been the job of scholars. It started with a few solo polymaths who dared to try the impossible. In ancient Greece, Aristotle single-handedly set out to record all the knowledge of his time. Four hundred years later, the Roman nobleman Pliny the Elder cranked out a thirty-seven-volume set of the day’s knowledge. The Chinese scholar Tu Yu wrote an encyclopedia on his own in the ninth century. And in the 1700s, Diderot and a few of his pals (including Voltaire and Rousseau) took twenty-nine years to create the Encyclopédie, ou Dictionnaire Raisonné des Sciences, des Arts et des Metiers.”