Which of these widely-used products was accidentally discovered in 1942 when a naval engineer spilled a bottle of synthetic rubber compound he was testing?

Throughout history, some of the world's most successful products were created entirely by accident! Inventors were often working on completely different problems when they stumbled upon revolutionary solutions. This trivia challenges your knowledge about serendipitous product innovation that changed industries and everyday life. Can you identify which famous product was discovered through an unexpected laboratory mishap?

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Play-Doh (originally created as a wallpaper cleaner before becoming a children's toy)
Silly Putty (the spilled silicone polymer bounced, leading to its development as a toy)
Post-it Notes (developed when a scientist created an adhesive that was 'too weak' for its intended purpose)
Teflon (discovered when a refrigerant gas experiment unexpectedly produced a slippery coating)