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Symmetry Magazine provides 60 second explanations of a series of physical phenomena, including the Acceleration of Particles, the Higgs Boson, superconductors, even The Standard Model, and much more. On Quarks:
Quarks are fundamental building blocks of matter. They are most commonly found inside protons and neutrons, the particles that make up the core of each atom in the universe. Based on current experimental evidence, quarks seem to be truly fundamental particles; they cannot be further subdivided.
Protons and neutrons mainly contain two types of quarks. These are called up and down quarks. For reasons still unknown, nature also designed two copies each of the up and down quarks, identical except for having larger masses. The heavier copies of the up quark are called charm and top quarks; the copies of the down quark are named strange and bottom quarks. Converting energy into mass, accelerators produce these heavier, short-lived quarks through particle collisions.
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