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Polybious invented Greek smoke signals in a form of an alphabet.
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The ancient Chinse invented smoke signals to communicate from large distances.
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Native americans used smoke signals to signal news from far distances.
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The military used smoke signals to signals for help or to signal new wars.
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Smoke signals are currently used to signal new popes and for the military.
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I think that smoke signals will be use for military planes in the future.
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Future smoke signals will be super hightech and implanted in your arm so you can just launch a smoke signal out of your arm. they will be used instead of phones, music, satellites, postal systems,telephone and computer.