This month, Smithsonian Magazine released its “Black in America” issue in honor of the opening of the Smithsonian's National Museum of African-American History and Culture. We talk with editor-in-chief Michael Caruso about the issue, and the future of activism via social media. Plus, Pulitzer Prize-winning poet and Emory University professor Natasha Trethewey reads her poem “We Have Seen.” The poem was inspired by the 53rd anniversary of the 16th Street Baptist Church bombing which killed four