Barbara Pecori (Bologna University) and Giacomo Torzo (Padova University) wrote the article "The Maxwell Wheel Investigated with MBL" for the September, 1998 issue of The Physics Teacher. A Maxwell wheel is similar to a yo-yo. The authors used our ULI and a Motion Detector to study the motion and the complex energy changes of the wheel or a yo-yo. They conclude the article with a study of the bounces of a ping-pong ball. The graph is a classic and we could not resist including it here.