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In 1945, United States scientists who worked on the first nuclear weapons (two were used against Japanese cities, Hiroshima and Nagasaki) set up an organization to print The Bulletin of Atomic Scientists, which warned of the dangers of nuclear weapons.As the Soviet Union began to develop such weapons in response, the Bulletin began to feature a Doomsday Clock, which set 12 midnight as doomsday, and a minute hand that signaled in a graphic way the danger of nuclear annihilation by how close it was to midnight.Over the decades the minute hand has moved closer or further away from midnight as the situation of the world changed. Recently, it has moved to one minute and 40 seconds, the closest ever.The Bulletin explained that there were now two main dangers.One was the increased likelihood of the use of nuclear weapons due to technological advances, if one could use that word to describe such a negative development.