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Please define non locality.
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It's what Einstein called "spooky action at a distance."
There's no simple way to describe it, but
this tutorial and
this essay are decent resources.
The two-sentence version is this.
Edit: It ended up being far more than two sentences and was still oversimplified to the point of inaccuracy. So I'm deleting, and will just reiterate that there's no easy way to describe it.