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What is exotic matter? Stranger Things' biggest headscratcher, explained

Stranger Things Season 5 Volume 2 introduces exotic matter as a key component of the Upside Down, but what is it, really?
Morning Overview on MSN

Scientists used a diamond to create a brand-new phase of matter

Physicists have taken a gemstone better known for engagement rings and turned it into a laboratory for one of the strangest ideas in modern physics, a phase of matter that repeats in time instead of ...