“If there is no connection between quarks and leptons, since quarks make up the proton, then the balance of the proton and electron charge is just a remarkable coincidence. It seems impossible for any thinking person to be satisfied with coincidence as an explanation. Some principle must relate the charges of the quarks and the leptons. What is it? A fancier way of saying it, and more or less equivalent, is that for the electroweak theory to make sense up to arbitrarily high energies, the symmetries on which it is based must survive quantum corrections.”

— Chris Quigg

Nature's greatest puzzles. http://arxiv.org/PS_cache/hep-ph/pdf/0502/0502070v1.pdf SLAC Summer Institute 2004, p. 9.

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American physicist 1944

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