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The human brain-or better yet Rip Torn's brain in "Defending Your Life"?
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The word computer was first used in 1613 which referred to a person who did calculations so the calculator.
I think that the Antikythera Mechanism has to be the world's oldest computer. The original doesn't work, but replicas have been made. It's fascinating; it really surpised me when I learned about it.
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