3 gen 150 anni a. C. - 150 BC Smoke Signals were Created

Descrizione:

IN 150 BC the Greek historian Polybius developed a complex alphabetical system of smoke systems by holding sets of torches in pairs. The North American Tribes had their own way of communicating, if smoke was coming from half way up the hill it meant all was well, if it was coming from the top, it means danger

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