Which famous invention was first marketed with the slogan "Now You See It, Now You Don't" when it was introduced to the public in the 1940s?

Throughout history, some of the most groundbreaking inventions and discoveries were accompanied by iconic marketing slogans that helped cement their place in our collective consciousness. These phrases not only sold products but often reflected the revolutionary impact these innovations had on society. Test your knowledge of how these world-changing inventions were first introduced to the public through their original advertising taglines.

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Polaroid Instant Camera
Microwave Oven
Teflon Non-Stick Coating
Transistor Radio