What was the original intended purpose of the adhesive that Dr. Spencer Silver developed at 3M in 1968, which eventually led to the creation of Post-It Notes?

In the realm of inventions and discoveries, some of the most impactful products emerge from unexpected circumstances. The humble Post-It Note revolutionized office work and personal organization worldwide, becoming one of the most successful consumer products of the 20th century. But how much do you know about the fascinating origin story behind this ubiquitous sticky note? Test your knowledge of this accidental innovation that transformed 3M's product lineup and created an entirely new product category!

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A super-strong adhesive for aerospace applications
A temporary bookmark adhesive for hymnals and bibles
A medical adhesive for surgical bandages
A removable adhesive for attaching pricing labels to products