If a fermion is travelling through a medium, it can have matter-induced
magnetic and electric dipole moments. These contributions conserve chirality,
and can be non-vanishing even for a Majorana neutrino. Several implications for
neutrino physics are discussed.Comment: (Talk given at the `Rencontres de Moriond', to appear in the
  Proceedings.) 4 pages LATEX, Report number DOE-ER 40757-007, CPP-93-0

Pal, Palash B