MIT Professor Walter H. G. Lewin’s videotaped physics lectures, available on OpenCourseWare, have won him fans around the world. See why The New York Times calls him a "web star" in this video which highlights his popular teaching style during 8.01, a first-semester freshman physics class. Highlights include Professor Lewin demonstrating the physics of pendulums and riding a fire-extinguisher-propelled tricycle across his classroom to show how a rocket lifts off. Watch Lewin's complete set of 8.01 physics lessons at OpenCourseWare.