Ever since I can remember, I have always been aware of something called the “Doomsday Clock,” a symbolized calculation produced by a panel of prominent scientists of just how close humanity is to destroying itself. Published on the cover of every issue of the Bulletin of the Atomic Scientists, a journal founded in 1945 by Manhattan Project physicists, the clock’s hands would move toward or away from the dreaded midnight hour depending on how near Armageddon was believed to be

As a kid, the Doomsday Clock seemed an appropriate warning of how the conflict between the US and the Soviet Union...