According to Post-It Brand Website, Dr. Spencer Silver, a 3M scientist, developed a repositionable adhesive, but he didn’t know what to do with his discovery. It wasn’t until six years later that his colleague, Art Fry, thought of a use for the adhesive. He was daydreaming about a bookmark that would stay put in his church hymnal and thus, the Post-it® Note was born.
Source: Wikipedia
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