Which of these famous products was originally discovered accidentally when a scientist was trying to develop a super-strong adhesive but instead created one that was surprisingly weak?

Throughout history, some of the world's most beloved and successful products were actually created by mistake! Inventors were working toward one goal but ended up discovering something completely different that changed the world. This trivia tests your knowledge about famous accidental inventions and discoveries that revolutionized consumer products. Can you identify which iconic item was born from an unexpected laboratory accident?

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Post-it Notes (the adhesive barely stuck but could be reused)
Super Glue (discovered when trying to make clear plastic gun sights)
Teflon (discovered while searching for new refrigerant chemicals)
Velcro (inspired by burrs sticking to a hunting dog's fur)