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

In the world of inventions, some of the most successful products were created by accident or had unexpected origins. The Post-it Note is one such iconic product that revolutionized office organization and communication. Its journey from laboratory mistake to everyday essential reveals fascinating insights about product design evolution and how companies transform technical discoveries into consumer products. Test your knowledge about this sticky innovation that changed workplaces forever!

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A super-strong adhesive that accidentally turned out to be too weak
A waterproof paper that unexpectedly repelled all types of ink
A heat-resistant coating that changed color when touched
A transparent tape alternative that became opaque when exposed to air