Which of these popular consumer products was initially developed as a failed medical innovation?

Throughout history, some of the most transformative products were discovered completely by accident! These serendipitous moments changed industries and consumer behavior forever. This trivia tests your knowledge about the fascinating stories behind accidental product discoveries that revolutionized how we live. Do you know which everyday items came from fortunate mistakes rather than intentional design?

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Play-Doh (originally created as a wallpaper cleaner before becoming a children's toy)
Super Glue (originally developed as a clear plastic for gun sights in WWII before its adhesive properties were discovered)
Viagra (originally tested as a treatment for angina and hypertension before its side effects were noted)
Post-it Notes (originally developed as a space-age adhesive that was deemed too weak for its intended purpose)