Shining light on an antiproton masquerading as an electron in a helium atom is a rich source of physics. An approach that brings this technique to unprecedented precision will allow new tests of matter–antimatter symmetry. See Letter p.484
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Charlton, M. Exciting antiprotons. Nature 475, 459–460 (2011). https://doi.org/10.1038/475459a
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DOI: https://doi.org/10.1038/475459a
