  I review the observational status of neutrino physics, including the present
hints for neutrino mass and the ways to reconcile the solar and atmospheric
neutrino data with the existence of a hot dark matter component, and the
possible hints from LSND. I also briefly discuss the electroweak symmetry
breaking sector of the Standard Model (SM), focussing on supersymmetric models
with broken R-parity and spontaneously broken lepton number. I discuss some of
the signals expected at future accelerators such as LEP II and LHC. They serve
to illustrate how neutrino mass effects may be testable not only at underground
and nuclear physics installations but also at high energy collider experiments.
