2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/183938I discuss the implications of neutrino oscillations for neutrino mass patterns and mass matrices, and for neutrinoless double beta decay. I then go on to discuss the implications for cosmological relic density and dark matter, the galaxy structure limits on neutrino mass, nucleosynthesis, supernovae, cosmic rays and gamma ray bursts.Plenary talk at the 4th Workshop on Neutrino Factories based on Muon Storage Rings (NuFact'02), Imperial College, London, July 1-6, 2002. 8 pages, 6 figs, (style files included)High Energy Physics - Phenomenologytext