Why did they invented Post-in notes?

Post-it Notes were invented by 3M scientist Spencer Silver in the late 1960s while he was attempting to create a strong adhesive. Instead, he developed a low-tack, reusable adhesive that allowed papers to stick together without leaving residue. In the late 1970s, his colleague Arthur Fry recognized the potential for this adhesive in creating a bookmark that could be repositioned, leading to the launch of Post-it Notes in 1980. They quickly became popular for their convenience in jotting down reminders and messages.