On this episode of Our American Stories, during the height of the Cold War, the United States worked tirelessly to stay ahead of the Soviet Union in the global arms race. Safeguards were put in place to prevent the accidental or unauthorized use of nuclear weapons, including special systems known as Permissive Action Links, or PAL codes. But for almost two decades, the launch code for America’s nuclear arsenal was just eight zeroes: 00000000. Simon Whistler, host of Today I Found Out and The Brain Food Show, explains why the most important code of the Cold War was so simple to crack.

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