The technology powering our microwave ovens has a surprisingly serendipitous origin. Percy Spencer, an American engineer working with magnetrons—vacuum tubes used in radar systems—made a curious discovery in 1945. While experimenting with a magnetron, Spencer noticed a peculiar sensation—his candy bar had melted in his pocket. Intrigued, he tested the magnetron’s effect on popcorn kernels, which promptly popped. Spencer realized that the electromagnetic radiation emitted by the magnetron could heat food. This accidental discovery led to the development of the first microwave oven, revolutionizing how we cook and heat our meals.

Prompt:
What technological advancement, often overlooked, has a fascinating historical connection to a surprising natural phenomenon?