What famous 'failed experiment' by 3M scientist Spencer Silver in 1968 eventually led to the creation of Post-it Notes?

The world's most famous sticky notes were the result of an invention process that exemplifies the power of serendipity and persistence in product development. This poll tests your knowledge of this iconic office supply's origins, which revolutionized how we organize information and communicate ideas in workplaces worldwide. Do you know the true story behind this ubiquitous product?

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An attempt to create a super-strong adhesive that accidentally produced a weak, pressure-sensitive adhesive that could be repositioned multiple times
A failed attempt to develop heat-resistant bookmarks for lab manuals that unexpectedly created paper that could temporarily stick to surfaces
An experiment to create waterproof paper that instead produced sheets with a strange tacky backing that could adhere to dry surfaces
A project to develop invisible ink markers that resulted in paper treated with a substance that could temporarily bond to smooth surfaces