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The holy grail of "free" energy, or the ultimate physics troll, depending on who you ask. It's the theoretical, lowest possible energy that a quantum mechanical system can have, even at absolute zero. This isn't empty vacuum; it's a seething foam of virtual particles popping in and out of existence. The dream is to somehow tap this boundless quantum froth for limitless power. The reality is it's likely impossible to harvest for useful work without breaking thermodynamics, making it the favorite buzzword of overconfident inventors and shady energy cons.
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