Which scientific product innovation was initially developed by 3M scientist Spencer Silver in 1968 as a 'failed' adhesive before becoming a wildly successful office product?

The intersection of scientific research and product development has led to numerous revolutionary innovations that have changed our world. Many of these innovations come from unexpected discoveries or creative applications of existing technologies. This trivia question tests your knowledge about a notable scientific product innovation that has significantly impacted both the scientific community and everyday consumers.

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Post-it Notes
Liquid Paper (correction fluid)
Graphene-enhanced conductive ink
Scotchgard fabric protector