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It often goes unmentioned that protons, the positively charged matter particles at the center of atoms, are part antimatter.
We learn in school that a proton is a bundle of three elementary particles called quarks two “up” quarks and a “down” quark, whose electric charges (+2/3 and −1/3, respectively) combine to give the proton its charge of +1. But that simplistic picture glosses over a far stranger, as-yet-unresolved story.
Quanta Magazine, an editorially independent publication of the Simons Foundation whose mission is to enhance public understanding of science by covering research developments and trends in mathematics and the physical and life sciences.