Which accidental discovery led to the creation of Post-it Notes, one of 3M's most successful product innovations?

Throughout history, product innovations have transformed industries and everyday life. Some inventions were deliberately created to solve specific problems, while others emerged through unexpected discoveries or even accidents. This poll tests your knowledge about a significant product innovation that changed an industry and consumer behavior. Can you identify the correct origin story behind this game-changing invention?

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A scientist spilled super-strong adhesive that couldn't be removed from paper, creating permanent sticky notes
A researcher developed a weak adhesive that failed quality testing but was perfect for removable bookmarks
Engineers designed temporary labels for electrical components that wouldn't damage sensitive circuits
Office workers kept losing memos, so 3M deliberately created sticky notes to address the problem