THE PRINCIPLES OF RAY DALIO – Billionaire investment fund pioneer Ray Dalio tells Bill Whitaker capitalism is broken and must be reformed because the income gap between rich and poor has become a “national emergency.” Guy Campanile is the producer. A RADICAL SOLUTION – Average debt incurred by medical students has reached home mortgage levels, causing some who want to become doctors to not even try. Now New York University, one of the nation’s top med schools, has implemented a 100-percent scholarship program – free tuition for everyone who gets in. Lesley Stahl reports. Rome Hartman is the producer. ATTU – The remote island in Alaska’s Aleutian Archipelago was the setting of a forgotten WWII battle fought on U.S. soil. It was also the beginning of a poignant story of closure and forgiveness when an American veteran and the daughter of the Japanese soldier he killed there meet 76 years later. Jon Wertheim reports. Draggan Mihailovich is the producer.