Which of these billion-dollar products was accidentally discovered when a scientist forgot to wash his hands before lunch after a day of laboratory experiments?

Throughout history, some of the world's most successful products were discovered completely by accident! From scientific breakthroughs to everyday items we now take for granted, these 'happy accidents' have revolutionized industries and changed how we live. Test your knowledge about these serendipitous discoveries that went from laboratory mishaps to retail sensations. Can you identify which famous product launch was truly an unplanned breakthrough?

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Post-it Notes (The adhesive was initially considered a failure for being too weak)
Saccharin artificial sweetener (Discovered when Constantin Fahlberg noticed a sweet taste on his hands after work)
Teflon (Discovered when Roy Plunkett found a strange waxy substance in a gas cylinder)
Velcro (George de Mestral noticed burrs sticking to his dog's fur after a hunting trip)