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An Article on Quarks at Wikipedia A quark is an elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the best-known of which are protons and neutrons. They are the only particles in the Standard Model to experience the strong interaction in addition to the three other fundamental interactions, also known as fundamental forces. Due to a phenomenon known as color confinement, quarks are never in isolation; they can only be found within hadrons. For this reason, much of what is known about quarks has been drawn from observations of the hadrons themselves. |