Between December 1942 and July 1945, a team of scientists, working in secret facilities in various parts of the U. S., researched, built, and tested the world’s first atomic bomb. Japan’s failure to surrender, together with the possibility of hundreds of thousands of casualties, motivated President Truman to drop an atomic bomb on the Japanese city of Hiroshima. Despite the bomb’s destruction of the city, including the immediate deaths of up to 80,000 people, Japan’s leaders still refused to surrender. Three days later, an American bomber dropped a second bomb on Nagasaki, leveling that city and killing nearly as many people as had perished at Hiroshima. Soon after, the Emperor led Japan to surrender. In this episode, James and Scott discuss the Manhattan Project, the dropping of the two atomic bombs, the Japanese surrender, and the end of the Second World War.