On April 10, 1849, an American mechanic named Walter Hunt received U.S. Patent No. 6,281 for an invention so simple it seems like it must have always existed: the safety pin. Hunt had twisted a single piece of brass wire into a clever loop with a clasp that hid the sharp point, making it safe to pin clothes and diapers without stabbing anyone. He sketched the design in just three hours.
Here's the wild part - Hunt invented the safety pin because he owed a friend $15. He needed quick cash, so he started fiddling with a piece of wire until he had a useful gadget. He sold the patent rights for $400, paid back his friend, and walked away. The company that bought the patent went on to make millions of dollars from his idea, while Hunt moved on to other inventions, including a precursor to the sewing machine.
The safety pin spread everywhere. Mothers used it to fasten cloth diapers (which is how it became famous), tailors used it to mark hems, and rock-and-roll kids in the 1970s clipped it through their jackets and ears as a punk rock symbol. Hunt may have given up his fortune for $400, but his pointy little invention is still tucked into sewing kits, costumes, and emergency outfit fixes all over the world.
