The mysterious numbers stations

Another gem from 99% Invisible:

If you tune around on a shortwave radio, you might stumble across a voice reciting an endless stream of numbers. Just numbers, all day, everyday. These so-called “numbers stations,” say nothing about where they are transmitting from or who they are trying to reach, but they can be heard in Spanish, English, German, Russian, Chinese, and any number of other languages from around the world.

Listen to the episode here, and if you’re intrigued see this Wikipedia entry.

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The mysterious numbers stations