Cosmic Neutrinos
  Neutrinos are key astronomical messengers, because they are undeflected by
magnetic field and unattenuated by electromagnetic interaction. After the first
detection of extraterrestrial neutrinos in the TeV-PeV region by Neutrino
Telescopes we are entering a new epoch where neutrino astronomy becomes
possible. In this paper I briefly review the main issues concerning
cosmological neutrinos and their experimental observation.
