Walter Hunt invented the safety pin in a matter of hours to settle a $15 debt. He took a piece of brass wire, coiled it in the center to create a spring action, and added a clasp at one end to shield the point. While similar pins existed in ancient Rome (fibulae), Hunt’s design was the first to include a spring and a protective cover for the tip, making it truly 'safe' for the user. Hunt famously sold the patent rights for a mere $400, missing out on millions in future royalties. The safety pin became an essential household tool, used for everything from infant care to emergency clothing repairs. It remains a perfect example of a simple mechanical solution to a common problem that has remained virtually unchanged for nearly two centuries.