From: utzoo!decvax!harpo!floyd!cmcl2!philabs!crh Newsgroups: net.trivia Title: Superman trivia Article-I.D.: philabs.10677 Posted: Tue Sep 14 12:14:28 1982 Received: Wed Sep 15 04:48:59 1982 References: uiucdcs.704 The imperfect duplicating ray was invented by Prof. Potter.