Jared Diamond is a geographer, historian and author best known for his international bestseller Guns, Germs and Steel. He talks with Dave Ross about his newest book, Upheaval: Turning Points for Nations in Crisis, in which he compares how six different countries emerged from periods of immense and historic change. Dave and Jared discuss an existential crisis at the root of Jared's own life work, and that feels particularly relevant as America spirals towards a crisis of our own: can we learn from our history?