jan 3, 150 BC - 150 BC Smoke Signals were Created
Description:
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 dangerAdded to timeline:
Date:
jan 3, 150 BC
Now
~ 2177 years ago