Time Travel Paradox Solves Itself at Quantum Level

"A paradox perennially posed to would-be time travelers may resolve itself — but only for a single photon at a time, and only at the quantum level. The 'Grandfather Paradox' points out that if time travel were possible and you went back and prevented your grandparents from meeting, you would prevent your own birth and subsequent time travel. It's an insoluble paradox — except, perhaps, at the smallest of scales..."

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