Over the past 50 years, dozens of articles have appeared in the Bulletin of the Atomic Scientists on the Cuban Missile Crisis. And with each passing year, new and relevant information has been reported -- which, for better or worse, has taught readers that the world was closer to full-scale nuclear war than was originally thought. Yet in October 1962, the Bulletin's Doomsday Clock remained unchanged: It stood at 7 minutes to midnight and the following year, in 1963, the clock's hands moved to 12 minutes to midnight, when the Partial Nuclear Test Ban Treaty went into effect.
But how did the Doomsday Clock -- the very existence of which indicated how close the world was to nuclear catastrophe -- stand still? The answers to this seeming anomaly are that the Doomsday Clock captures trends and takes into account the capacity of leaders and societies to respond to crises with reasoned actions to prevent nuclear holocaust. The Cuban Missile Crisis, for all its potential and ultimate destruction, only lasted a few weeks; however, the lessons were quickly apparent when the United States and the Soviet Union installed the first hotline between the two capitals to improve communications, and, of course, negotiated the 1963 test ban treaty, ending all atmospheric nuclear testing. Others have suggested that the gravity of the Cuban Missile Crisis has been defined by decades of scholarship but that, in 1962, the world population, to a large degree, was unaware of what exactly had just happened. Or, more precisely, what hadn't happened.
The Bulletin turned to a few of its current Science and Security Board and Board of Sponsors members -- those who together decide the time of the Doomsday Clock -- to ask them to share their personal memories or personal reflections of the Cuban Missile Crisis.
What follows is a day in the life, from Siberia to Rhode Island, in October 1962: Essays of what the Cuban Missile Crisis meant and didn't mean then, and what it should mean today.

Even for a young man in distant Sri Lanka, the reports on the Cuban Missile Crisis in the newspapers and on BBC radio were ominous. But in 1962, there was no television in this developing country to make the situation seem more tense, and, indeed, incredible as it seems in the hindsight of history, the vast majority of the country was ignorant of how close we were to nuclear Armageddon. Having barely emerged from four and a half centuries of crippling colonialism, Sri Lanka was now threatened -- by radiation and climatic and other effects -- in a contest for global supremacy not of its making and in which it had no part.
Years later, as a diplomat dedicated to the cause of peace and disarmament, I learned from conversations with Robert McNamara, Ted Sorensen, and others that we were all saved by sheer luck. The record of the crisis -- dramatized in so many film documentaries and interviews with the actual participants -- proves beyond doubt that the policy makers on both sides had no access to many relevant facts and were groping in the fog of the Cold War.
The passage of five decades and the introduction of hotlines, permissive action links, and other technological brakes on the launch of nuclear warfare has not decreased the threat of nuclear war. Nine nuclear-weapon-armed states have a total arsenal of 19,000 warheads, nearly 2,000 of which are on high operational alert. The threat has in fact increased, and potential for use of nuclear weapons -- whether intentionally or by accident, through computer error or cyber attack or terrorism -- is only too real. There is no guarantee that we will have luck on our side, as we did during the Cuban Missile Crisis, in our time. To reduce the likelihood of an Armageddon that will doom all countries -- large and small, sophisticated or less so -- we must: