Welcome to the multiverse, where every possibility exists in parallel. It's a lot like a choose-your-own-adventure game, but with fewer choices and more dimensions.
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Parallel universes are, well, parallel. They're like the infinite mirrors in a funhouse, but without the fun.
Alternate realities are like the what-if stories you tell yourself, but with more math.
Quantum fluctuations are like the cosmic equivalent of a nervous tic, but with more probability.