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What did Hedy Lamarr actually invent?

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What did Hedy Lamarr actually invent?

Hedy Lamarr, a Hollywood star, was also an inventor whose work shaped modern technology. During WWII, she co-invented a frequency-hopping technology to prevent enemy jamming of torpedo guidance systems. Though initially ignored, her invention became the foundation for wireless tech like Bluetooth and Wi-Fi. Lamarr's scientific genius was ...

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