Which accidental discovery by Spencer Silver at 3M in 1968 initially failed as a product until a colleague found an innovative use for it years later, eventually becoming one of the company's most successful inventions?

The 20th century saw numerous groundbreaking product innovations that fundamentally changed how we live. Some inventions were deliberate breakthroughs after years of research, while others were happy accidents that revolutionized industries. This poll tests your knowledge about the development process behind one of history's most influential product innovations and how it transformed from discovery to mass-market phenomenon.

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Post-it Notes (originally a 'low-tack' adhesive that was considered too weak for traditional applications)
Scotchgard (originally a spill on tennis shoes that created a stain-resistant area)
Microwave oven (originally noticed when a chocolate bar melted near radar equipment)
Gore-Tex fabric (originally a failed attempt to create plumber's tape that had unexpected breathable properties)