January 29 is National Puzzle Day!
This got me thinking about the history of jigsaw puzzles: when were they invented, what is a jigsaw, and any other nerdy things I could research. Here are some fun facts I discovered.
John Spilsbury, a London cartographer and engraver, is believed to have produced the first "jigsaw" puzzle around 1760. It was a map glued to a flat piece of wood...