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James McLean wrote
==>But charge comes only in multiples of a single fundamental amount,
==>while as far as I know the same is not true of mass.
True, but outside of high energy situations (which on the Earth means
outside of particle accelerators and cosmic rays) everything is made of
up and down quarks, which although quite similar, are clearly different.
The mass of the d quark is 1.4 to 4 times the mass of the u
(as of the 1992 Particle Properties Data Booklet)