Totally cheated here…
Play-Doh (Wallpaper Cleaner): Originally created in the 1930s by Cleo McVicker to remove soot from wallpaper. When vinyl wallpaper made this unnecessary, it was repurposed as children’s modeling clay in the 1950s.
WD-40 (Nuclear Missile Lubricant): Stands for “Water Displacement, 40th attempt.” It was created in 1953 by the Rocket Chemical Company specifically to protect the outer skins of nuclear missiles from corrosion, not for household maintenance.
Super Glue (Gun Sights): Dr. Harry Coover was trying to create clear plastic gun sights during World War II when he invented cyanoacrylate. It was initially dismissed for being too sticky before it was repurposed as a fast-acting adhesive.
Bubble Wrap (Wallpaper): In 1957, Alfred Fielding and Marc Chavannes sealed two shower curtains together, creating a pattern of air bubbles. They tried to sell it as fashionable wallpaper before realizing its potential for shipping protection.
Slinky (Ship Instruments): Engineer Richard James was trying to develop a system of springs to stabilize and support sensitive instruments on ships in 1943. When he dropped one and saw it “walk,” he realized it was a toy.
Vaseline (Drilling Machine Scum): Chemist Robert Chesebrough noticed a “gloppy scum” that accumulated on petroleum drills in the mid-1800s. He discovered that workers used it to heal cuts and burns, so he rebranded it as Petroleum Jelly.
Kotex (Wartime Bandages): During World War I, Kimberly-Clark developed “Cellucotton,” a material far more absorbent than cotton, to be used as surgical bandages. After the war, the company repurposed the leftover material into the first sanitary napkins.
Post-it Note Adhesive (Super-Strong Glue): Dr. Spencer Silver, a scientist at 3M, was trying to develop a high-strength adhesive. He instead created a “low-tack,” reusable, pressure-sensitive adhesive that later found its purpose on sticky notes.
Kevlar (Tire Reinforcement): Stephanie Kwolek was trying to develop a lightweight material to reinforce tires, but her experiments led to the creation of the ultra-strong fiber used in bulletproof vests.
Micro-encapsulated Ink (Ribbonless Typewriter Paper): A paper company created this to eliminate the need for typewriter ribbons, but it was a failure. It smeared when handled, but its technology was later adapted for other purposes.
Gunpowder (Immortality Medicine): Originally developed by Chinese alchemists in the 9th century who were trying to create an elixir of immortality, it was later discovered to be explosive.