The world is definitely not going to end today. So don't worry. But! If you enjoy worrying, or just really want to be prepared for future apocalypses, then the March 1951 issue of Popular Science is required reading. In the middle of the Cold War, we published an eerily-illustrated handbook for surviving an atomic bomb strike, from preparing your family's foxhole to what to do if you're caught outside during the blast. Unfortunately, none of these preparations were likely to do much good if your neighborhood was actually hit by a nuclear bomb, but some of the advice might come in handy against mysterious Mayan voodoo (or whatever.)