Post-it Notes are celebrating their 28th anniversary, and the simple little sticky sheets which were officially stuck on shelves April 6, 1980 have become an important part of the home and office.
Although Post-its started out with just the classic canary notes, today theyre available in eight standard sizes, 25 shapes, and 62 colors.
The history of the adhesive behind Post-its dates back to 1968, when Dr. Spencer Silver, a researcher for 3M, created an adhesive that would stick to surfaces but could be easily removed and repositioned.
Dr. Silvers colleague, Art Fry, came up with the idea of putting the adhesive on little sheets of paper in 1974, while he was singing in his church choir and kept having to deal with a bookmark falling from his hymnal. Six years later, Post- its were on the market.
According to researchers, todays average professional receives 11 Post-it messages each day, so a world without Post- its would be no world at all.
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