Nearly half a million people in the U.S. get Lyme disease every year, and most of them face symptoms that last a few weeks after the tick bite that transmitted the disease. But for some patients, the symptoms can last much longer. The medical community has been slow to recognize this form of long-lasting Lyme disease, and to find treatments for it. Winslow Crane-Murdoch, the co-director of a new documentary about Lyme disease, joins us to talk about his film "The Quiet Epidemic," and the history and controversy surrounding the medical treatment of the disease.