In the pdf and print versions of the This Issue page, the page number information for the Cover Story was incorrect. It should have appeared as [Article p484].
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The online version of the original article can be found at 10.1038/nphys343
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Erratum: This Issue. Nature Phys 2, 514 (2006). https://doi.org/10.1038/nphys382
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DOI: https://doi.org/10.1038/nphys382
