There is mild excitement at the prospect of using anti-hydrogen as a means of telling whether the charges of protons and antiprotons differ, and, if so, by how much.
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Maddox, J. Is charge quantization exact?. Nature 358, 449 (1992). https://doi.org/10.1038/358449a0
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DOI: https://doi.org/10.1038/358449a0
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