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Maybe 9000 or so years ago some guy was taking a walk and tripped over something, when he picked it up he said: "Oh my I just found an abacus! I have no idea if it is useful for anything or not, as I have never seen one before. The beads are not even pretty, just plain wood." He then threw it away and rubbed his sore toe until it felt better and continued his walk.

The above is of course nonsense as mechanisms like the abacus are not found, they are invented or designed. While it is hard to verify as documents don't go back as far as the first abacus (it was already present and used in many cultures before writing or even oral history developed), one could likely say the time given above (9000 years ago) to be a reasonable estimate of when they first were used.

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14y ago

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