The seemingly limitless possibilities promised by the idea of a multiverse are so captivating to the imagination that I doubt the idea will go away any time soon. Â It’s only grown in popularity in spite of constant criticism that it is completely theoretical and untestable. Â Most definitions of the multiverse would seem to explicitly rule out any human being ever interacting with another universe besides our own. Â But now some scientists have proposed an observational test based on our universe interacting with other universes.
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