The Universe is made of matter, not antimatter, and 'CP violation' in particle decays could be the reason. Results from experiments measuring this effect at last confirm the predictions of a 30-year-old theory.
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Peskin, M. The matter with antimatter. Nature 419, 25–27 (2002). https://doi.org/10.1038/419024a
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DOI: https://doi.org/10.1038/419024a
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