A square of paper with a strip of low-tack adhesive on the…

A square of paper with a strip of low-tack adhesive on the back, allowing it to be stuck, removed and repositioned without leaving marks. Its glue was discovered by chemist Spencer Silver at 3M in 1968 while trying to create a strong adhesive. Colleague Art Fry later used it to keep bookmarks in his church choir hymnal. Launched across America in 1980, the canary yellow pads became an office staple.

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