Smoke signal
The smoke signal is one of the oldest forms of long-distance communication. It is a form of visual communication used over a long distance.
The smoke signal is one of the oldest forms of long-distance communication. It is a form of visual communication used over a long distance.
The smoke signal is one of the oldest forms of long-distance communication. It is a form of visual communication used over a long distance.
Source: Wikipedia "Smoke signal" · CC BY-SA 4.0
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