In Britain in 60, Boudicca, queen of the Iceni tribe, led a revolt against the occupying Romans. According to the historian Tacitus, her forces killed seventy thousand people, sacking and burning the cities later known as St. Albans, Colchester, and London. “We must conquer in the line of battle or fall,” she announced before her final charge. “That is the fate of this woman; let men live on as slaves if they wish.”

As he watched the mushroom cloud form at the first atomic-bomb test in July 1945, physicist J. Robert Oppenheimer recalled a line from the Bhagavad Gita: “Now I am become Death, the destroyer of worlds.”