Which failed experiment at 3M eventually led to the development of the iconic Post-it Notes in the 1970s?

In the world of inventions, some of the most impactful products came from unexpected origins or failed experiments. The Post-it Note is a perfect example of how 'mistakes' can lead to billion-dollar products. This trivia challenges you to know the real story behind one of 3M's most iconic office innovations that fundamentally changed how we organize information and communicate in workplaces worldwide.

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An attempt to create a super-strong adhesive that accidentally produced an unusually weak, pressure-sensitive adhesive
A research project to develop heat-resistant bookmarks for hymn books that could be easily removed without damaging pages
An effort to create biodegradable paper products that resulted in paper with unexpected adhesive properties
A cost-cutting initiative to reuse waste paper pulp that created paper with unique adhesive capabilities