  The existence of large extra dimensions enables to explain very simply the
various neutrino suppression data. The flavour neutrinos, confined on the
brane, are coupled to a "bulk" neutrino state, which is seen as an infinite
tower of Kaluza-Klein states from the 4-dimensional point of view. The
oscillation of flavour neutrinos into these states can lead to a global and
sizable energy-independent suppression at large distances, which can be related
to the solar neutrino puzzle.
