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The parallel Worlds of Quantum Mechanics come into existence on observation.
Everett does NOT postulate [that] at certain magic instances, the the world undergoes some sort of metaphysical “split” into two branches that subsequently never interact....According to the MWI, there is, was and always will be only one wavefunction, and only decoherence calculations, not postulates, can tell us when it is a good approximation to treat two terms as non-interacting.