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

Abakcus

@abakcus

Abakcus is the best curation site for math and science. Please subscribe my weekly newsletter! It is FREE!

参加 June 2020

285 フォロー中 98.5K ファン

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.