ANSWERS: 3
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The inventor of the abacus is lost to history, as similar devices appeared in many cultures. It was invented sometime during 1000 BCE and 500 BCE. It is a counting device; therefore, it is used for calculations. http://en.wikipedia.org/wiki/Abacus
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I invented it.. Me the evil ELFF
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It almost certainly came from China, where, by the way, it is still used a lot. History can't be absolutely sure, but historians lean toward that theory.
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