A revolutionary approach to treating the nation's heroin epidemic

Lester Holt speaks to Airbnb co-founder and CEO Brian Chesky in Cuba about the revolutionary home-sharing website and app. Chesky will address criticism that Airbnb faces in cities across the world. Harry Smith explores the driverless car revolution with the godfather of the technology, and America's best-known car enthusiast, Jay Leno. Josh Mankiewicz reports on a ground-breaking approach to treating the nation's heroin epidemic.