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What Is Déjà Vu?

If you’ve ever been going about your day as usual, only to be struck by the sudden feeling that you’ve somehow—however improbably—already experienced what you’re going through, then congratulations: You’ve just experienced déjà vu. You might even know the name for the feeling. But what is déjà vu, really? And what could possibly explain this weird and unsettling experience?
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