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Spies can eavesdrop by watching a light bulb’s variations

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Spies can eavesdrop by watching a light bulb’s variations

THE LIST OF sophisticated eavesdropping techniques has grown steadily over years: wiretaps, hacked phones, bugs in the wall—even bouncing lasers off of a building’s glass to pick up conversations inside. Now add another tool for audio spies: Any light bulb in a room that might be visible from a window.

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