Walkmans may have been firmly cast into oblivion but another 80's invention, the Post-it Note, is marking its 30th anniversary this month The little yellow square paper that changed lives was actually the product of an engineering mistake by 3M scientists who accidentally stumbled upon an adhesive that could stick, and be repositioned on just about any surface. <img alt="" src="/imagedata/2010/apr/Post-it-Notes.jpg" border="0" /> Ever since then it has remained among the top five best-selling office supplies in USA each year. The three-by-three-inch pad has evolved and now comes in eight sizes, 25 shapes and 62 colours, including the original canary yellow, sold in 150 countries. Syracuse University professor of popular culture Robert Thompson said, "My guess is people will still be using Post-it notes in a 100 years." 3M vice president William Smith marked the sticky reminder's anniversary by recalling that consumers report daily that life without them is simply unimaginable. It has also kept a steady eye on the future. 3M launched this year, the Post-it Greener Note, engineered with a plant-based adhesive and 100 per cent recycled paper. "The Post-it note has made life easier for people in today's fast-paced world full of information,"u00a0 said Fry (78), as he was inducted into the National Inventors Hall of Fame. 50.7 crore The approximate number of post -- it's required to circle the entire world once

Walkmans may have been firmly cast into oblivion but another 80's invention, the Post-it Note, is marking its 30th anniversary this month

Post-it turns 30

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Post-it turns 30

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