What was the original failed experiment that eventually led to the invention of the Post-It Note at 3M in the 1970s?

In the world of inventions and discoveries, some products were created intentionally while others emerged by accident. The Post-It Note, a ubiquitous office supply found in workplaces worldwide, has a fascinating origin story that exemplifies how failed experiments can lead to groundbreaking products. Test your knowledge about this iconic adhesive innovation that revolutionized how we leave notes and reminders.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

An attempt to create a super-strong adhesive for the aerospace industry
A search for a better bookmark that wouldn't damage book pages
An experiment to develop transparent tape with different colored backings
A project to create self-dissolving paper for confidential government documents