Which of these famous products was accidentally discovered when a researcher failed at his original goal of creating a super-strong adhesive?

Throughout history, many revolutionary products were discovered entirely by accident! Scientists and inventors sometimes stumble upon breakthroughs while searching for something completely different. This trivia tests your knowledge about famous accidental discoveries that transformed into billion-dollar industries. Do you know which everyday items were created by mistake rather than deliberate design?

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Post-it Notes (The adhesive was criticized for being too weak, until 3M realized this 'failure' was perfect for temporary notes)
Super Glue (Discovered when a scientist trying to make clear plastic gun sights accidentally glued his fingers together)
Silly Putty (Created during WWII attempts to make synthetic rubber when scientists mixed boric acid and silicone oil)
Teflon (Discovered when a refrigerant gas experiment unexpectedly produced a slippery substance that wouldn't stick to anything)