Our intuitive understanding of the universe is that it is locally real. For the universe to be local means that things are only affected by their immediate surroundings, and to be “real” means that things have a definite state at all times.
Weirdly this is not true. A particle can be in a superposition where it simultaneously is in multiple states at once. Also entangled particles can affect their counterparts at any distance, faster than light.
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