A statistical model utilizing the Thomas-Fermi approximation is advanced wh
ich, by assuming Z(0) and W+/- bosons to be massless particles like photons
, explains the short range of weak forces by means of the screening propert
ies of the negative-kinetic-energy neutrino distribution which, according t
o the Dirac equation, fills the whole universe. In addition, a conjecture i
s proposed ascribing the current electron and neutrino masses to an evoluti
ve process which took place while the universe was cooling.