While it is becoming increasingly common (and easy) for lectures to be placed online as videos or podcasts, such media can often be very limited in their utility. For example, I missed a lecture last ...

All of Walter Lewin’s 8.01, 8.02, and 8.03 lectures are available on MIT OpenCourseWare: 8.01: Classical Mechanics (Fall 1999) 8.02: Electricity and Magnetism (Spring 2002) 8.03: Vibrations and Waves ...