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feb 20, 150 BC - SMOKE SIGNAL

Description:

The earliest form of long distance communication. Greek historian, Polybius, developed a system of alphabetical smoke signals by holding sets of torches in pairs.

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Technology Change over the Years

ByOlivia Xiao
26 Nov 2018
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Date:

feb 20, 150 BC
Now
~ 2177 years ago
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