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Dark matter might not be matter at all.That’s the suggestion from physicist Michio Kaku, and it’s a wild one.His idea is that the invisible pull we keep blaming on mystery particles could actually be gravity leaking into our universe from a parallel dimension.Sit with that for a second. Physicists have spent decades hunting for whatever dark matter is made of. Kaku’s take flips the whole search on its head. Maybe there’s nothing here to find, because the source isn’t here at all.We could be feeling the weight of a world we can’t see.Next door.