As Carl Sagan said, "You have to know the past to understand the present." History has shaped our nation's character, and our collective strength is measured in how we came together during our most challenging moments: the Civil War, World War I, Prohibition, World War II, the Dust Bowl, McCarthyism, the Cold War, the Challenger disaster, Operation Desert Storm, 9/11 and countless struggles before and since. But history also contains triumphs, from ending slavery to the moon landing to the fall of the Berlin Wall to Mars rover Curiosity. Join in discussion on these and more with historians, collectors, authors, professors and conspiracy theorists alike. Our hosts also show much support for our troops and military families. In fact, technology has played a big part in bringing soldiers closer to home, as they text, email and Skype from the front, and our â€œtalk to the troopsâ€ episodes are always inspiring.