Stranger Things' Parallel Universes Explained by a Scientist

The Upside Down, Stranger Things Wiki

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Stranger Things: Multiverse Theory And The Upside Down, Explained

Stranger Things' Season 4: Biggest Questions, Answers, and Theories - The Ringer

Multiverse - Wikipedia

The Parallel World In 'Stranger Things' Isn't As Crazy As It Sounds — Science Explains

Science Just Proved That 'Stranger Things' Upside Down Is Real And Here's The Proof - PopBuzz

Stranger Things: The First Shadow': Prequel play first look - Los Angeles Times

Stranger Things in real life? Scientists conducting experiment to prove the existence of parallel universe - IBTimes India

Stranger Things,' Parallel Universes, And The State Of String Theory

Is there evidence of an 'upside down' (parallel universe) like in Stranger Things? - Quora