Can we test for parallel worlds?

A new theory suggests many worlds have existed, side-by-side, since the beginning of time. Parallel worlds are standard fare for sci-fi, but the idea originates from quantum physics where the seemingly bizarre notion of alternative universes is taken very seriously. Now an Australian team has taken the weirdness a step further. Their new theory, published last month in Physical Review X, is dubbed “Many interacting worlds”. It not only proposes that stable parallel worlds exist but...

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