The Annals of Improbable Research awarded its annual Ig Nobel Peace Prizes last week. The 2002 winners include Karl Kruszelnicki of The University of Sydney, for performing a comprehensive survey of human belly button lint -- who gets it, when, what color, and how much; Arnd Leike of the University of Munich, for demonstrating that beer froth obeys the mathematical Law of Exponential Decay; Chris McManus of University College London, for his excruciatingly balanced report, "Scrotal Asymmetry in Man and in Ancient Sculpture"; and Vicki L. Silvers of the University of Nevada-Reno and David S. Kreiner of Central Missouri State University, for their colorful report "The Effects of Pre-Existing Inappropriate Highlighting on Reading Comprehension."