By August 1945, World War II was over in Europe, but the fighting continued between American forces and the Japanese, who were losing but determined to fight till the bitter end. And so it fell to a new president--Harry S. Truman--to make the fateful decision to drop two atomic bombs--one on Hiroshima and one on Nagasaki--and bring the war to a rapid close. Now, even decades later, can anyone know if this was the right choice?