Pairs of quantum-mechanically entangled particles seem to know at once what is happening to each other. Experiments show that even if this signalling is not instantaneous, it must be really, really fast.
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Rudolph, T. The speed of instantly. Nature 454, 831–832 (2008). https://doi.org/10.1038/454831a
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DOI: https://doi.org/10.1038/454831a