A Pill that Prevents HIV; Black Barbershops and Civil Rights; "Outside Mullingar"; Please Explain

A pill called Truvada has been shown to prevent HIV—it’s safe, effective, approved by the FDA, and often covered by health insurance. We’ll find out why so few people are taking it. We’ll look into the cultural history of black barbershops in the United States since the 19th century, and the role they played in the civil rights movement. Debra Messing and Bryan F. O’Byrne talk about starring in John Patrick Shanley’s latest play, “Outside Mullingar.” Plus: following last week’s Please Explain about dogs, this week, we’ll find out all about cats!