Which of these iconic products was accidentally invented when a researcher failed in his original experiment but noticed an unusual and useful property in his 'failed' creation?

Throughout history, some of the most groundbreaking innovations and beloved products were actually discovered by accident! Scientists, engineers, and inventors sometimes stumbled upon their greatest achievements while pursuing completely different goals. This trivia challenges you to identify which famous product was created through a serendipitous laboratory mishap that transformed an experimental failure into a worldwide phenomenon.

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Post-it Notes (Spencer Silver was trying to develop a super-strong adhesive but created a weak, reusable one instead)
Velcro (George de Mestral was deliberately mimicking burrs that stuck to his dog's fur after a hunting trip)
Teflon (Roy Plunkett was intentionally developing a non-stick coating for cookware after studying polymers)
Bubble Wrap (Alfred Fielding and Marc Chavannes designed it specifically as protective packaging from the start)