Smoke Signals (11 h 11 m, 29 agos 1800 año aC – 22 h 44 m, 30 jun 500 año)

Descripción:

For a long time, Smoke Signals were used as the main form of communication. This is because it could be used over a long distance. In 150BC, the Greeks created a system of alphabetic characters and converted it into numeric characters. This way they could convert it using pairs of torches into smoke signals.

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