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A Flaw in a Universal Mirror

Without a slight asymmetry in a "mirror" called CP invariance the universe as we know it would not exist; instead it would be devoid of matter. What force in nature causes the flaw?

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Scientific American Magazine Vol 258 Issue 2This article was originally published with the title “A Flaw in a Universal Mirror” in Scientific American Magazine Vol. 258 No. 2 (), p. 50
doi:10.1038/scientificamerican0288-50