What failed experiment ultimately led to the invention of Post-it Notes at 3M in the 1970s?

Sometimes the most revolutionary products emerge from unexpected discoveries. In the world of product design, the story behind 3M's Post-it Notes stands as a testament to how serendipity and persistence can lead to groundbreaking innovation. This trivia question explores the fascinating origin story of one of the most ubiquitous office products that changed how we communicate and organize information. Test your knowledge about this iconic accidental invention!

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An attempt to create a super-strong adhesive that accidentally produced a weak, reusable one
A color-changing paper experiment that resulted in yellow sheets that wouldn't change color
A waterproof notebook project that failed but created paper with unusual adhesive properties
A heat-resistant label test that produced paper that wouldn't stay permanently attached