Peter Sagal, the host of NPR's "Wait Wait, Don't Tell Me!" has been running for most of his life. His new memoir, "The Incomplete Book of Running," reflects on how that simple exercise, of which 60 million Americans participated in during 2017, has brought him solace throughout his life. Sagal joins Forum to discuss what it's like making fun of the news for a living and what he's learned after 14 marathons and innumerable miles logged.