semper ubi su
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Yes, from ancient gaming pieces. (Maybe like dominoes or dice? We need an antiquities expert!)
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Does that mean when we're doing calculations you could say we have rocks in our head?
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Transistors are just *really* tiny pebbles
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Hmmm... I have been doing calculations all wrong, all along! Time to collect a few pebbles
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Yes, specifically the pebbles as used on an abacus ;)
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Should we expect photographs of Roman abaci, with said pebbles?
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Consulting http://Miriam-Webster.com , it looks like 'chalk' also has its root in the Latin 'Calc' (pebble).
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Never going to calculate again. There's totally a choking hazard here.
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Now I also understand the term «renal calculi».
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