Best-selling author Umberto Eco's work unlocks the riddles of history in an exploration of the "linguistics of the lunatic," stories told by scholars, scientists, poets, fanatics, and ordinary people in order to make sense of the world. Exploring the "Force of the False," Eco uncovers layers of mistakes that have shaped human history, such as Columbus's assumption that the world was much smaller than it is, leading him to seek out a quick route to the East via the West and thus fortuitously "discovering" America. The fictions that grew up around the cults of the Rosicrucians and Knights Templar were the result of a letter from a mysterious "Prester John"―undoubtedly a hoax―that provided fertile ground for a series of delusions and conspiracy theories based on religious, ethnic, and racial prejudices. While some false tales produce new knowledge (like Columbus's discovery of America) and others create nothing but horror and shame (the Rosicrucian story wound up fueling European anti-Semitism) they are all powerfully persuasive