Non-gaussian electrical fluctuations in a quasi-2d packing of metallic   beads
  The electrical properties of a two-dimensional packing of metallic beads are studied. Small mechanical perturbations of the packing leads to giant electrical fluctuations. Fluctuations are found to be non-gaussian and seem to belong to Levy stable distributions. Anticorrelations have been also found for the sign of these fluctuations. 
N.Vandewalle, C.Lenaerts and S.Dorbolo