Which famous adhesive product was initially considered a failure because it didn't create a strong enough bond, before becoming one of the most successful office products ever?

Throughout history, many of our most important products and innovations weren't the result of careful planning, but rather happy accidents or unexpected observations. These serendipitous discoveries transformed industries and shaped modern life in ways their discoverers could never have imagined. Test your knowledge about these remarkable product development stories that showcase how chance observations, mistakes, and persistence led to groundbreaking inventions.

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Post-it Notes
Gorilla Glue
Elmer's Glue
Krazy Glue