This is a pretty well known story to the puzzler community but if you’ve never heard it before, here’s the condensed version: in 1932 Theodore Edison, youngest son of famous inventor Thomas Edison, created a puzzle of twelve rectangular blocks and named it, you guessed it, “The Calibron Twelve Block Puzzle”. Here’s what his instructions said: “The problem is to arrange the twelve blocks to form a single large rectangle. Any rectangle, (including the square), […]