They used real-life stories of “ambiguous luck”—for example, a Japanese man who survived the bombings of Hiroshima and Nagasaki in World War II, practically unscathed, and lived a long life, and an American soldier who had a rocket-propelled grenade, which did not explode, lodged in his abdomen. Both men survived horrific experiences, which makes them lucky—unless you think that the fact that bad things happened to them at all makes them unlucky.