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may 4, 150 BC - smoke signals

Description:

Smoke signals are one of the oldest forms of long distance communication.
Chinese soldiers used it to alert one and other.
Some indigenous north american tribes used it was a signal, half way up the hill meant everything was good but at the top of the hit it meant something was bad.
A Greek man also made a hole alphabet out of the smoke signals.

Added to timeline:

2 months ago
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Date:

may 4, 150 BC
Now
~ 2170 years ago
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