Artificial intelligence researcher and US Air Force Captain Eric Halloway recently published a fun thought experiment showing how simple it would be to prove we live in one of multiple universes. His theory relies on inventing a quantum coin-flipper and using a ray gun to vaporize an unknowable number of people across the entire spectrum of the multiverse. Basically, it’s the plot of Avengers: Endgame. Here’s the gist: Quantum physics tells us that quantum particles exist in a state called superposition until they’re measured. If you imagine a quantum particle as a coin, it’s neither heads nor tails and both…

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