Which of these revolutionary products was originally invented as a solution for pharmaceutical researchers but later transformed an entirely different industry?

Throughout history, groundbreaking inventions have often emerged from unexpected circumstances or been initially designed for entirely different purposes than what made them famous. Many of our most beloved products have fascinating origin stories that few consumers know about. This trivia question explores the surprising beginnings of a product that revolutionized an industry and changed how we interact with technology.

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Post-it Notes, which were created when a scientist at 3M accidentally developed a weak adhesive that could stick papers together temporarily without damaging them
Microwave ovens, which were developed after a researcher noticed a chocolate bar melting in his pocket while working with radar equipment
Velcro, which was inspired by burrs sticking to a Swiss engineer's clothing after a hunting trip in the Alps
Bubble wrap, which was originally designed as a new textured wallpaper before becoming a packaging material