When Dick’s Sporting Goods CEO Ed Stack took over the family business, it was only two stores. Now the company has over 700 stores, making it one of the biggest sports retailers in the country. Stack recounts all this, as well as the company’s decision to cut back on gun sales following the Parkland, Florida, shooting, in his new book “It’s How We Play the Game.” Stack and Kai Ryssdal talk about the book, the gun sale controversy and corporate responsibility.