Abakcus(@abakcus):John Napier, the guy who invented logarithms, also carved multiplication onto ten ivory rods you could carry in your pocket. No gears, no machine — you line them up, read a row, and add. Europe used them for 200 years. They called them Napier's Bones. https://t.co/HrWaRMEHXn

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Abakcus@abakcus

2026.07.24 03:21

John Napier, the guy who invented logarithms, also carved multiplication onto ten ivory rods you could carry in your pocket. No gears, no machine — you line them up, read a row, and add. Europe used them for 200 years. They called them Napier's Bones.