Abstract
In the last few years our understanding of neutrino intrinsic properties has expanded in a revolutionary and unexpected way. The results of experiments with solar, atmospheric, reactor, and accelerator neutrinos are all (or almost all) consistent and lead to the inescapable conclusion that neutrinos are massive but very light particles and that they are mixed. By that we mean that the electron, muon, and tau neutrinos νe, νμ, ντ that are produced in the weak decays are not particles with a definite mass (in fact, perhaps for that reason we should not call them elementary particles at all), but rather superpositions of particles with a definite mass, usually just denoted ν1, ν2, ν3.
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