Which accidental discovery led to a product that revolutionized the food preservation industry but was initially marketed for an entirely different purpose?

The path from invention to iconic product often involves surprising twists and pivotal marketing decisions. Some of history's most transformative products emerged from unexpected discoveries, while others were the result of deliberate innovation strategies. Test your knowledge about the origin stories behind groundbreaking products that changed industries and influenced how we approach product development and brand positioning today.

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Microwave oven - discovered when a chocolate bar melted near radar equipment, initially marketed as a commercial restaurant solution
Teflon - discovered while searching for refrigerant gases, initially marketed as industrial machinery coating
Post-it Notes - discovered from a failed super-strong adhesive experiment, initially marketed as bookmark placeholders
Bubble Wrap - originally developed as trendy textured wallpaper, initially marketed as greenhouse insulation