Which household consumer product was originally invented by Percy Spencer after he noticed a chocolate bar melting in his pocket while working with an active radar set in 1945?

Some inventions start as modest consumer products but go on to revolutionize daily life worldwide. This trivia tests your knowledge about groundbreaking consumer products that significantly impacted society, transformed industries, or created entirely new markets. Can you identify the origins and interesting facts about these world-changing innovations?

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Microwave oven
Electric toaster
Non-stick cookware (Teflon)
Instant coffee