2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/221632In this talk I review what we know and don't know about neutrinos, neutrino masses and lepton mixing. I also discuss the importance of the discovery that neutrinos have nonzero masses, and illustrate how little is currently known about the physics behind them.Invited Talk at Heavy Quarks and Leptons, Melbourne, 2008, to appear in the proceedings. 6 pages and 3 eps figuresHigh Energy Physics - Phenomenologytext