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Dirac argued that this anomaly was in fact the electron's "antiparticle," the subatomic equivalent of the "evil twin." In fact, he asserted, every particle has an "antiparticle" with nearly identical properties, except for an opposite electric charge. And just as protons, neutrons, and electrons combine to form atoms and matter, antiprotons, antineutrons, and antielectrons (called positrons) combine to form antiatoms and antimatter. His findings led him to speculate that there may even be a mirror universe made entirely of antimatter.