  This talk, dedicated to the memory of G. Giacomelli, introduced the round
table on neutrinos held in February 2014. The topics selected for the
discussion are: 1) the neutrinoless double beta decay rate (interpretation in
terms of light neutrinos, nuclear uncertainties); 2) the physics in the
gigantic water Cherenkov detectors (proton decay, atmospheric neutrinos); 3)
the study of neutrino oscillations (mass hierarchy and CP violation; other
neutrino states); 4) the neutrino astronomy at low and high energies (solar,
supernova, cosmic neutrinos). The importance of an active interplay between
theory and experiment is highlighted.
