Scholars often cite February 23, 1455 as the original publication date for the “Gutenberg Bible,” the first mass-produced book in Europe. This elegant, two-volume Latin Bible was one of the earliest works made using movable metallic type, a system of individual letters and character pieces that could be rearranged and reused during printing. Its popularity signaled a global revolution for the written word. Books previously had to be laboriously copied by hand, yet only a half-century after the Gutenberg Bible became the world’s first printed bestseller, millions of different volumes were flying off presses across Europe. Explore seven fascinating facts about one of the rarest and most influential books in world history.