What famous 'failed' adhesive experiment at 3M eventually led to the invention of Post-it Notes?

In the world of inventions and discoveries, some of the most impactful products came about by accident or through unexpected paths. The humble Post-it Note revolutionized office communication and personal organization, becoming one of the most successful consumer products in history. But do you know the fascinating story behind this ubiquitous sticky note? Test your knowledge about this game-changing invention that transformed how we work and remember things.

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A super-strong glue that accidentally dried too quickly and lost its adhesive properties
A permanent adhesive that unexpectedly dissolved when exposed to paper
A weak adhesive that was initially rejected for being too weak, but found perfect for temporary, repositionable notes
A temperature-sensitive adhesive originally designed for aerospace applications that proved too costly to produce