You've seen it in countless works of film and fiction -- a shady operative hands someone a folder, marked 'classified,' or 'top secret.' But what is classification in real life? What makes one piece of information fit for the public, and another piece the kind of thing that has to be buried for generations? In today's episode, the guys explore the fact, fiction and controversy surrounding how the government chooses the stuff it doesn't want you to know. They don’t want you to read our book.