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2. Shoe size - Wikipedia

   en.wikipedia.org/wiki/Shoe_size

   A shoe size is an indication of the fitting size of a shoe for a person. There are a number of different shoe-size systems used worldwide. While all shoe sizes use a number to indicate the length of the shoe, they differ in exactly what they measure, what unit of measurement they use, and where the size 0 (or 1) is positioned.

3. Chisanbop - Wikipedia

   en.wikipedia.org/wiki/Chisanbop

   Chisanbop. The Chisanbop system. When a finger is touching the table, it contributes its corresponding number to a total. Chisanbop or chisenbop (from Korean chi (ji) finger + sanpŏp (sanbeop) calculation [ 1] 지산법/指算法), sometimes called Fingermath, [ 2] is a finger counting method used to perform basic mathematical operations.

4. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   Trachtenberg system. The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Russian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration ...

5. Napier's bones - Wikipedia

   en.wikipedia.org/wiki/Napier's_bones

   Napier's bones. Napier's bones is a manually-operated calculating device created by John Napier of Merchiston, Scotland for the calculation of products and quotients of numbers. The method was based on lattice multiplication, and also called rabdology, a word invented by Napier. Napier published his version in 1617. [ 1]

6. Stepped reckoner - Wikipedia

   en.wikipedia.org/wiki/Stepped_reckoner

   To multiply by numbers over 9: The multiplicand is set into the operand dials. The first (least significant) digit of the multiplier is set into the multiplier dial as above, and the crank is turned, multiplying the operand by that digit and putting the result in the accumulator. The input section is shifted one digit to the left with the end ...

7. For sale: baby shoes, never worn - Wikipedia

   en.wikipedia.org/wiki/For_sale:_baby_shoes...

   e. "For sale: baby shoes, never worn." is a six-word story, one of the most famous examples of flash fiction. Versions of the story date back to the early 1900s, and it was being reproduced and expanded upon within a few years of its initial publication. [ 1][ 2] The story is popularly misattributed to Ernest Hemingway; this is implausible, as ...