In the latest CIGI-BSIA policy brief, James G. Blight and janet M. Lang examine John F. Kennedy’s (JFK’s) cautious skepticism — his “Black Swan logic”— which he used to scrutinize the potentially disastrous consequences of US military intervention. JFK’s black swan logic helped him to avoid his hawkish advisers’ forceful attempts to bring the United States into conflicts that would have quickly escalated into nuclear war. Shedding new light on his misunderstood behaviour during an era of nuclear uncertainty, Blight and Lang conclude that JFK’s skeptical, cautious approach is as indispensable now as it was during his presidency.