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The smallest particles of matter are the six quarks and six leptons. Three of these, the up quark, the down quark and the electron make up ordinary matter. Each particle has an antiparticle partner that can be produced and studied - antiparticles are not just the stuff of science fiction, they are science fact and can be studied in the laboratory. Produced with equal amounts of matter in the Big Bang why do we not find them in nature nowadays?
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