World’s Strangest

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Knitted Napier’s Bones

Because they are awesome, Pat Ashforth, Steve Plummer and Ben Ashforth illustrate math through their crafting projects. Pictured above is their knitted version of Napier’s Bones, a calculation device invented by Scottish mathematician John Napier (1550-1617). George Hart explains how they work: The image below shows how to arrange the bones if you wanted to [...]