  Although the framework for oscillations of the three neutrino flavors in the
Standard Model has been convincingly established, indications persist that it
may be incomplete. Challenges are coming from the LSND and MiniBooNe
short-baseline experiments, from the neutrino sources used in the Gallex and
Sage solar neutrino experiments and, more recently,from an a-posteriori
analysis of reactor neutrino experiments. One way to accommodate the reported
"anomalies", if real, is to introduce one or more sterile neutrinos in the mass
range $\delta m^2 \sim 1 eV^2$. TeV atmospheric neutrinos propagating through
the Earth undergo resonant oscillations in the presence of sterile neutrinos; a
clear signature in a neutrino telescope like IceCube is the the change in shape
of the zenith-energy distribution of the atmospheric neutrinos.
