Lawrence Wright on Modern Terror. Ben Utecht on the Concussions That Stole His Memory.

Pulitzer Prize-winning author Lawrence Wright joins us to discuss his latest book, "The Terror Years," which traces the rise of modern terror groups from Al-Qaeda to ISIS. Michael Adams, Professor of English Language and Literature at Indiana University, discusses the importance of foul language in popular speech in his book, "In Praise of Profanity." National Geographic contributor Richard Conniff on how the fur industry could be made humane. Former NFL player Ben Utecht on the concussions he suffered on the field - and how they led to the memory loss he suffers today.