In 1968, Spencer Silver, a scientist at 3M, was trying to develop a powerful adhesive. Instead, he accidentally created a material that could stick to surfaces but could also be easily removed. This substance, made of tiny acrylic microspheres, had strong adhesion to surfaces but weak overall adhesion, meaning it wouldn't hold onto things for long. The National Inventors Hall of Fame notes that Silver was working on new types of adhesives, aiming for "power," or strong stickiness. The Minnesota Historical Society pointed out that the material was developed by accident and is light enough to detach easily. At first, Silver's adhesive was seen as an off-topic result in the lab. The company was looking for durable adhesives, and this discovery offered the opposite—something that could be removed. For several years, it had no practical use because the adhesive market needed durability, and no one had a problem that required an adhesive that could be removed. Later, Art Fry, a researcher at 3M, came across Silver's adhesive while trying to find a bookmark that would stay in his hymn book. He coated paper with the adhesive and created bookmarks that could be placed, removed, and replaced. The weakness of the adhesive became its quality, as it was enough to mark a page but allowed for easy removal. The meeting between Silver and Fry was significant. 3M admits that without this collaboration, the product might never have been launched. A chemist had the solution, and a colleague had the problem, but they didn't work together at first. Turning a temporary bookmark into a mass-produced product involved overcoming two major obstacles: creating the right equipment and manufacturing processes, and ensuring the adhesive remained well attached to the paper with consistent adhesion. Commercial trials took place in 1977 and 1978, notably in Boise. The national launch in the United States occurred in 1980, 12 years after the accidental discovery of the adhesive. Silver joined 3M in 1966 and remained there until his retirement in 1996. His adhesive, which was initially considered too weak, took only two years of his career to develop, but it took 12 more years before it found its audience. The story challenges a common reflex in companies: classifying a result that doesn't answer the question posed as a failure. Silver's adhesive didn't answer the original question, but it solved another, which no one had yet formulated. When you peel a sticky note from its surface to reattach it elsewhere, you're using a property that its inventor once considered a defect.