A record measurement of the proton's magnetism has been achieved by confining a single proton in a device called a double Penning trap. The result opens the way to exploring one of nature's fundamental symmetries. See Letter p.596
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Kostelecký, V. The magnetic proton. Nature 509, 571–572 (2014). https://doi.org/10.1038/509571a
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DOI: https://doi.org/10.1038/509571a
