A fundamental scientific assumption called local realism conflicts with certain predictions of quantum mechanics. Those predictions have now been verified, with none of the loopholes that have compromised earlier tests. See Letter p.682
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Wiseman, H. Death by experiment for local realism. Nature 526, 649–650 (2015). https://doi.org/10.1038/nature15631
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DOI: https://doi.org/10.1038/nature15631