Anthony Brooks, NPR
Law professor Morton Horwitz lectures at Harvard's Paine Hall.
There's at least one on every campus: a class so popular, a professor so inspiring that there's a waiting list to get in. As students head back to class after winter break, NPR surveys some of the hottest courses on the nation's campuses.
In the first part of the series, NPR's Anthony Brooks sits in on a Harvard law history class that's in such demand that students must enter a lottery to attend.