1/ For nearly 100 years, secret agents have been communicating with each other using "numbers stations". https://en.wikipedia.org/wiki/Numbers_station …
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3/ Some broadcasts last a few seconds, others whole decades. One eerie broadcast is the Swedish Rhapsody, here: https://www.youtube.com/watch?v=GUQUD3IMbb4 …
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These are the keyed codes made up during WW1 & WW2
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