Jigsaw puzzles were invented to teach geography, became a Depression-era obsession, and somehow ended up on every coffee table during a global pandemic — and they never really left. This week we dig into the surprisingly rich history of the humble puzzle, why finishing one feels so unreasonably satisfying, and the quiet cult of people who do them alone, in silence, at an almost suspicious level of dedication. If last week's late-night embroiderers made you feel seen, this one's for everyone who's ever hidden a puzzle under the couch so guests don't judge them.