POST-IT NOTES
In 1968, Dr. Spencer Silver, a scientist at 3M in the United States, 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, in a church choir in North St. Paul, Minnesota, was frustrated that his bookmarks kept falling out of his hymnal. He had attended one of Silver's seminars, and, (I love this part) while listening to a sermon in church, he came up with the idea of using the adhesive to anchor his bookmarks to his hymnal, and the first "Post-It Notes" were born. Now you can find these helpful little notes all over the world posted on everything from desks to walls. They serve as reminders of appointments, of things to get at the grocery store, of things we need to remember to shut off or turn on. They help us to remember the most important things.
From Spencer Homan's Sermon "Think Real Hard (Importance of Study)"