Dr. Daniel Federman (Dean, Harvard Medical School) published a paper in Academic Medicine (1999, 74, 93-4) and cited a situation described by Mark Twain. I have been contacted asking for assistance in locating the source of the original passage. "Twain pointed out that the world's greatest duelist had nothing to fear from the world's second greatest. They both knew and used the strokes and moves, and the greatest was in that lofty position because he was the better at them. What the greatest had to fear was the uninformed clod who picked up a stick for the first time and used it in some novel way for which the number one (and the number two) were unprepared." Does anyone recognize the original source for this passage? Thanks, Barb