[language] as used to communicate between humans in writing or in speach. Also the development of the [technology] used for it. (Consider adding those tags as appropiate.)

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Historically, how did people living in distant regions communicate?

For example, how did Marco Polo manage to communicate with the Chinese and the Mongolians during his travels? Did he learn Chinese? Did he manage to find a Chinese translator somehow? Was there a ...
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The Purpose of Mystery Object 40.9.11

In the summer of 1915, a wireless telegraph station in Sayville, Long Island owned by the German company Telefunken was caught sending covert commands to U-Boats patrolling the Atlantic Ocean. The ...