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1940s Tech Innovations

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Created November 21, 2025

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The 1940s wasn't just defined by war; it was a crucible for technology

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that built our modern world. Here are the three main technological innovations of the

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decade. First, the Electronic Computer. Completed in 1945,

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the ENIAC was a room-sized giant powered by vacuum tubes. It calculated complex

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math in seconds, laying the physical groundwork for the digital device you are using right

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now. Second, Microwave Technology. While working on radar magnetrons for

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WWII, engineer Percy Spencer noticed a candy bar melted in his pocket.

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This happy accident led to the first commercial microwave oven in 1947.

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