Which of these billion-dollar consumer products was accidentally discovered when a scientist failed to wash his hands after lab work and later noticed something unusual?

Scientific discoveries often come from careful planning and methodical research, but sometimes, the most revolutionary products arise from complete accidents. This trivia question explores one of the most financially successful lab accidents in scientific history - a consumer product that revolutionized its industry and became a household name. Can you identify this accidental scientific discovery that went on to generate billions in sales?

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Post-it Notes (The adhesive was originally a failed attempt at creating a super-strong glue)
NutraSweet/Aspartame (The scientist accidentally licked his finger and noticed the sweet taste)
Teflon (A failed refrigerant experiment left behind a slippery substance in storage containers)
Super Glue (Originally developed as a clear plastic for gun sights but kept sticking to everything)