This summer, renowned filmmaker Christopher Nolan returns to the big screen with "Oppenheimer," his second movie based on real wartime events — the first was "Dunkirk" (2017). This time around, however, he's not taking us to the frontlines of World War II, but instead dealing with the complicated process behind the creation of the first nuclear weapons . The biopic follows the "father of the atomic bomb," J. Robert Oppenheimer. It's being marketed as a cautionary tale of sorts and may be a good reminder of the astounding destructive power of nuclear weapons. Who was J. Robert Oppenheimer? (Image credit:...