Which of these famous products was accidentally discovered when a researcher failed to wash his hands after a lab experiment?

Throughout history, some of the most successful products were actually discovered by accident! These happy accidents led to revolutionary market expansions, innovative marketing strategies, and transformed entire industries. Test your knowledge about these serendipitous discoveries that became household names and retail sensations. Can you identify which famous product was discovered through an unexpected laboratory mistake?

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Post-it Notes (when an adhesive that wasn't sticky enough was considered a failure)
Artificial sweetener (when a chemist noticed an unexpectedly sweet taste on his fingers)
Microwave oven (when a candy bar melted in an engineer's pocket near radar equipment)
Velcro (when burrs stuck to a hunter's clothing after a walk in the woods)