VHS tapes and walkmans may have been firmly cast into oblivion, but Post-It Notes are stronger than ever, 30 years after their invention. The little colored square of paper that changed lives was actually the product of an engineering mistake by 3M scientists who accidentally stumbled upon an adhesive like none other that could stick and be repositioned on just about any surface. It has remained among the top five best-selling office supplies in the U.S. ever since. Post-It Notes now come in eight sizes, 25 shapes and 62 colors – all sold in 150 countries.
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