A layered sedimentary rock but that's just what long division looked like in those days
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Sure, sure - upstart newfanglers use calculus to mean something else these days. But originally it was a smooth pebble used for calculation.
aug 20, 2025, 3:54 pm • 1 0 • view
This I did not know
aug 20, 2025, 4:42 pm • 0 0 • view