The Standard Model of particle physics has it that quarks are fundamental particles. But an experiment that echoes two past revolutions in our understanding of matter might hint instead at an even smaller level of structure.
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Wilczek, F. A crack in the Standard Model?. Nature 380, 19–20 (1996). https://doi.org/10.1038/380019a0
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DOI: https://doi.org/10.1038/380019a0
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