"The encyclopedia once shaped our understanding of the world. Created by thousands of scholars and the most obsessive of editors, a good set conveyed a sense of absolute wisdom on its reader. Contributions from Albert Einstein, Sigmund Freud, Orville Wright, Alfred Hitchcock, Marie Curie and Indira Gandhi helped millions of children with their homework. Adults cleared their shelves in the belief that everything that was explainable was now effortlessly...