State of physics at the end of the 20. century: Massive neutrinos?

A brief review of neutrino masses is presented with focus on how masses might appear in unified models. A fall 1996 status report of the LSND (Liquid Scintillator Neutrino Detector) experiment at Los Alamos is given; the statistical evidence for neutrino oscillations is becoming stronger. A summary of a unified model based on SO(18) shows possible complications in understanding neutrino masses.