What was the original failed product experiment at 3M that eventually led to the invention of Post-it Notes?

The path to innovation is often paved with unexpected discoveries. Some of the world's most useful products began as mistakes or experiments gone wrong, only to become billion-dollar successes. The Post-it Note represents one of the most famous 'accidental' inventions in corporate history, but how much do you know about its true origin story? Test your knowledge about this sticky office staple that revolutionized how we organize information.

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A super-strong adhesive that proved too weak for industrial applications
A waterproof paper that couldn't repel liquid but had unusual adhesive properties
A heat-resistant coating that failed temperature tests but stuck well to surfaces
A transparent tape formula that was too opaque but showed reusable sticking ability