Why do the up ad down quarks have different masses?
= Why do the up ad down quarks have different masses?
{wiki}
https://www.quora.com/Why-do-up-quarks-and-down-quarks-have-different-charges
= Why do the up ad down quarks have different masses?
{wiki}
https://www.quora.com/Why-do-up-quarks-and-down-quarks-have-different-charges