What was the original project that Spencer Silver was working on at 3M when he accidentally discovered the adhesive used in Post-It Notes?

3M's Post-It Notes are an iconic office product that revolutionized how we share information. But their invention wasn't planned - it came from a 'failed' adhesive experiment. This poll tests your knowledge about this famous product development story that demonstrates how unsuccessful experiments can lead to billion-dollar innovations when viewed from a different perspective.

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Developing super-strong adhesives for the aerospace industry
Creating waterproof paper for underwater documentation
Designing tear-resistant packaging materials
Formulating temperature-resistant glues for electronics