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Two up quarks, one down, and the gluon field that will not let them leave.
A proton is less an object than a knot in a field. Its size is the width of the knot, not the size of anything inside it.
The Standard Model: every particle found so far, and no smaller parts inside any of them. Seventeen particles, and no evidence that any of them is made of anything. Between the finest thing we can…