Post-it Notes came from glue that failed to stick. ποΈ . . . In 1968, 3M scientist Spencer Silver created an adhesive that stayed tacky but peeled away cleanly. Nobody found a use for it for 6 years. Then Art Fry coated paper bookmarks for his church hymnal in 1974βthe failed superglue became a multibillion-note idea.
Source
Smithsonian Magazine, 2012, 'How the Post-it Note Was Invented'
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