Sandel has taught the famous "Justice" course at Harvard for two decades. More than 14,000 students have taken the course, making it one of the most highly attended in Harvard's history. The fall 2007 class was the largest ever at Harvard, with a total of 1,115 students. The fall 2005 course was recorded, and is offered online for students through the Harvard Extension School. An abridged form of this recording is now a 12-episode TV series, Justice: What's the Right Thing to Do?, in a coproduction of WGBH and Harvard University.