NO. 4, from KERA's Think show with host Krys Boyd: When parents shell out tens of thousands of dollars for their children to attend prestigious colleges, oftentimes the classes are led not by tenured professors but by teaching assistants. Georgetown University professor Jacques Berlinerblau spoke with us about how universities function – and about how students can get more out of their education dollars. Enjoy our No. 4 most popular #education episode of the year.