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When the Spanish Conquistadors encountered the mighty Inca empire, they found thousands of knotted-up ropes called quipus. Encoded in these quipus were tax records, census data, and the entire history of the Inca empire. But the secret to these ancient computers have been lost to time. Today, scientists are trying to crack the unbreakable code in these strings and bring the history of this great empire back to life.

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