@sundogplanets Without getting into the group theory the main difference between QED (electromagnetism) and QCD (strong nuclear force) is that photons don't have an electric charge, but gluons do have a color charge. That's what leads to confinement: the "lines of force," instead of spreading out as in QED, attract each other, so they form tubes that act like rubber bands. That's why you get quark confinement: if you try to pull them apart you just make more quarks from the energy! 1/2
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