Americans suffer from around a billion colds a year, and Jennifer Ackerman explains what a cold is and what new research about colds shows. Then, a three-time oyster-shucking champion from Prince Edward Island demonstrates on-air how to do it right! And This American Life contributor David Rakoff explains the benefits of seeing the glass half empty. Also, Darin Strauss tells how a tragic event long ago has haunted him. Plus, director Olivier Assayas and actor Edgar Ramírez discuss their new film about the infamous terrorist known as Carlos the Jackal.