Clarke, Arthur C. Against the Fall of Night (New York: ibooks, 2005) 151 p.

Long after people have forgotten how the marvelous machines they once made work, the Keeper of the Records continues to maintain and explore the vast ancient database of information. Rorden uses a machine called an associator. "If you give it a set of facts, it will hunt through the sum total of human knowledge until it correlates them." (p. 15).