How does a computer work?

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Reckoning with a master of calculation

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Reckoning with machines

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Programmable Musical Instruments

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Rechnen mit dem Kugelrechner

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Reckoning in the Middle Ages

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Discrete Mathematics

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Secret messages for Santa Claus

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Dr. Ina Prinz

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From Augustus till today

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Reckoning with a master of calculation

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Fingers, stones, knots

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