Just Post-it

In 1968, Dr. Spencer Silver, a scientist at 3M in the United States, with the help of Jesse Kops, a fellow scientist, accidentally developed a "low-tack," reusable pressure sensitive adhesive. For five years, Silver promoted his invention within 3M, both informally and through seminars, but without much success. In 1974, a colleague of his, Art Fry, who had attended one of Silver's seminars, came up with the idea of using the adhesive to anchor his bookmark in his hymnbook.