Many of the Walter Lewin Lectures on Physics at MIT have been shown for over six years on UWTV in Seattle, reaching an audience of about four million people. Lewin personally responded to hundreds of e-mail requests that he received per year from UWTV viewers. For fifteen years he was on MIT Cable TV, with programs aired 24 hours per day helping freshmen with their weekly homework assignments. Lewin also teaches video courses on Newtonian Mechanics, Electricity and Magnetism, and Vibrations and Waves, which can be viewed from the MIT OpenCourseWare web site. His MIT lectures for science teachers and for middle school students can be viewed on MIT World. Various lecturers all around the world make use of these lectures to teach their students.