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Beneath the fluorescent lights of the National History Museum, a security guard named Elias stood by the imposing archway of the Walk-Through Metal Detector (WTMD). To the thousands of tourists passing through daily, it was just a gate—beep, walk through, maybe get wanded, move on. But Elias, a retired radio engineer, knew better. He knew that inside that beige metal housing lay a symphony of invisible physics.

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