Now, more than ever, a diversifying United States needs a shared base of knowledge. That’s according to Eric Liu, executive director of the Citizenship and American Identity Program at the Aspen Institute. He’s calling on the American public and cultural leaders to build a crowd-sourced national list of facts and references every American should know. In this “Extra” episode, he talks to David Henry Hwang, Tony-winning American playwright, screenwriter, and opera librettist. He is the child of Chinese immigrants and shares how, growing up, he used television as one way to integrate into American society. (Music: Podington Bear/Jack)