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Science 17 March 2000:
Vol. 287. no. 5460, pp. 1909 - 1910
DOI: 10.1126/science.287.5460.1909
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QUANTUM MECHANICS:
'Spooky Action' Passes a Relativistic Test

Charles Seife

The most unnerving idea in quantum mechanics may be "spooky action at a distance"--the notion that certain particles can affect one another almost instantly across vast reaches of space. Recently in Geneva, that aspect of quantum surreality survived the most cunning trap so far, a series of experiments that pitted it against basic principles of Einstein's relativity. The results gave the most accurate estimate yet of how rapidly the "spooky action" might operate.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)