In the development of Post-it Notes, what was the original goal of Spencer Silver's research at 3M that led to the adhesive used in these iconic products?

In the world of inventions and discoveries, some of the most useful products emerge from unexpected places. This poll explores one of the most famous accidental discoveries that revolutionized office work worldwide. While many inventions come from deliberate research and development, this particular product stemmed from what initially appeared to be a failed experiment, leading to one of the most successful brand positioning stories in office supply history.

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To create a super-strong adhesive for aerospace applications
To develop a temporary bookmark that wouldn't damage pages
To invent a reusable envelope sealing system
To formulate a removable label for laboratory sample containers