What was Dr. Spencer Silver originally trying to develop at 3M when he accidentally created the adhesive later used in Post-it Notes?

The journey from failed experiment to revolutionary product is a fascinating aspect of product development history. In 1968, a scientist at 3M was attempting to create a super-strong adhesive but instead accidentally created something entirely different that would later transform office work worldwide. This trivia question explores how some of our most useful everyday products emerged not from intentional design, but from recognizing potential in what initially seemed like failure.

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A super-strong adhesive for aerospace applications
A removable bookmark for church hymnals
A waterproof glue for underwater construction
A heat-resistant adhesive for kitchen appliances