The standard model can't predict the rest masses of all known and unknown particles - something is missing from it.I have found an equation by trial and error that predicts all quark masses: EQUATION THAT PREDICTS QUARK REST MASSES The following equation generates the masses, in Gev, associated with the six quarks: Down, up, strange, charm, bottom, top and predicts the masses of two new quarks labelled X1 and X2. M = 12.50 x 10 3pi (n – 5) / 2 0 x ( n – 4 ) 2 x 10 39 ( n – 3 ) / 2 x 10 57 x q n (5) M = f (n) q n Where n is an odd numbered integer and q is the magnitude of the electric charge associated with the mass. The equation was based on the idea that mass = constant x q n and that the constant depends on n and is different for each quark pair - the pairs are next to each other in the table. QUARK CHARGE n MASS (Gev) ) DOWN - 1/3 -1 0.0088 UP + 2/3 -1 0.0044 X1 -1/3 +1 0.084 X2 +2/3 +1 0.16 STRANGE -1/3 +3 0.21 CHARM +2/3 +3 1.72 BOTTOM -1/3 +5 5.20 TOP +2/3 +5 167.25 I now understand why this equation works and I am going to submit it to a journal later in the year.The quark at n = +1 doesn't actually exist because of the colour force.This equation enables the rest mass of the muon to be predicted accurately too! The constant k changes for each quark family.