Microwaves. Fact: Microwaves were discovered by accident when chocolate melted instantly in Percy Spencer's pocket.

American engineer Percy Spencer first noticed the ability of high-frequency radiation to heat food, so he patented the microwave oven. At the time of the invention, Percy was working for Raytheon, a company that made radar equipment. According to legend, when Spencer was experimenting with the magnetron, he noticed that a piece of chocolate in his pocket had melted.

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