Which famous invention was initially marketed as a failure prevention tool rather than the common household item we know today?

The world of inventions and discoveries is filled with fascinating stories of products that transformed industries and everyday life. Behind many groundbreaking innovations are surprising brand strategies and marketing decisions that helped shape their success. Test your knowledge about the lesser-known facts behind famous inventions and how they were introduced to the world!

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Post-it Notes, which 3M originally tried to market as a bookmark that wouldn't damage pages
Microwave oven, which Raytheon first promoted as a specialized tool for scientific laboratories
WD-40, which was first advertised exclusively as a nuclear missile protection coating
Bubble Wrap, which was originally marketed as a trendy textured wallpaper for modern homes