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 Maria Hinojosa, an award-winning news anchor and reporter. She founded the Futuro Media Group and hosts Latino USA, NPR’s only national Latino news and cultural weekly radio program. (Music: Podington Bear/Jack)