Which of these popular consumer products was accidentally invented when researcher Spencer Silver was trying to create a super-strong adhesive but instead created a 'low-tack' reusable adhesive?

Throughout history, some of our most beloved products and scientific breakthroughs happened completely by accident! From failed experiments to laboratory mishaps, these 'happy accidents' changed the world in unexpected ways. Test your knowledge about these serendipitous discoveries and the products that emerged from them. Do you know which common household items or revolutionary technologies were never part of the original plan?

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Post-it Notes
Scotch Tape
Velcro
Super Glue