One of my common topics is the history of nuclear weapons. The "atom bomb" is a rich vein of history because its impact has been as much cultural as technical. Dramatic depictions like Christopher Nolan's Oppenheimer have recently enforced, perhaps even revived, the perception of nuclear weapons as an innovation that forever changed warfare. More quietly, historians and strategists tend to wonder if that is still true today, or if it was ever as true as was supposed—the conventional firebombing of Tokyo probably claimed as many victims as the nuclear attacks on Hiroshima and Nagasaki, for example. Besides, it's not unusual to hear people overstate the significance of nuclear weapons to WWII in a way that is obvious with a brief inspection of the timeline. The technology became available only very late in the war, and for that reason if no other, it must have had less of an impact on the outcome than other revolutionary wartime developments like radar.