In 1968, 3M chemist Spencer Silver set out to create an ultra-strong aerospace adhesive and instead produced a glue so weak it could barely hold paper together. What it could do was stick, peel off cleanly, and stick again, thanks to an acrylate copolymer that formed tiny microspheres. For five years Silver pitched a solution without a problem, until colleague Art Fry, frustrated by bookmarks falling out of his church hymnal, used 3M's permitted bootlegging policy in 1974 to coat the edge of some paper with it.

This episode follows the Post-it Note from its accidental canary yellow, borrowed from a neighboring lab's scrap pile, through the failed 1977 Press and Peel launch, the free-sample Boise Blitz of 1978, and the 1980 national rollout. It explores Randy Garner's 2005 study showing a blank sticky note boosted survey completion and quali ...