Which of these innovative products was invented by accident in 1968 when scientist Spencer Silver was attempting to create a super-strong adhesive but instead created a 'low-tack' reusable adhesive?

Product innovation has transformed our world in countless ways. Some inventions were so groundbreaking that they created entirely new markets or revolutionized existing ones. This trivia question focuses on a famous product innovation that not only solved a practical problem but created an entirely new category of consumer goods. Test your knowledge of pivotal moments in product development history!

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Post-it Notes
Teflon Coating
Super Glue
Velcro Fasteners