Today's episode is about two books that examine the United States' relationship with other countries during contentious moments in history. First, Here & Now's Robin Young speaks with Daniel James Brown about his book, The Boys in the Boat, which profiles the American rowing team that beat Germany during the 1936 Olympics. George Clooney's film adaptation comes out later this year. Then, NPR's Frank Stasio chats with Kai Bird and Martin J. Sherwin about American Prometheus, the biography of J. Robert Oppenheimer behind this summer's blockbuster.