  We introduce Weyl's scale invariance as an additional local symmetry in the
standard model of electroweak interactions. An inevitable consequence is the
introduction of general relativity coupled to scalar fields a la Dirac and an
additional vector particle we call the Weylon. We show that once Weyl's scale
invariance is broken, the phenomenon (a) generates Newton's gravitational
constant G_N and (b) triggers spontaneous symmetry breaking in the normal
manner resulting in masses for the conventional fermions and bosons. The scale
at which Weyl's scale symmetry breaks is of order Planck mass. If right-handed
neutrinos are also introduced, their absence at present energy scales is
attributed to their mass which is tied to the scale where scale invariance
breaks.
