The invention of Post-it Notes was an accidental collaborative effort between Dr. Spencer Silver and Art Fry, both 3M scientists. Fry provided the first commerciallyÂ viable application for the adhesive that Silver created duringÂ one of his experiments.
Silver's discovery of a sticky substance known as "microspheres" had a high "tack," low "peel" characteristic but no immediate practical application for it. Fry, meanwhile, needed a bookmark for his choir hymnals that would stick to the pages and not constantly fall out. In a flash of inspiration, he remembered Silver's adhesive and realized that a sticky note would perfectly solve his problem. Fry and Silver then entered into a joint venture to further develop their product, later known as Post-it Notes.