  We show that galaxy redshift surveys sensitively probe the neutrino mass,
with eV mass neutrinos suppressing power by a factor of two. The Sloan Digital
Sky Survey can potentially detect $N$ nearly degenerate massive neutrino
species with mass m_nu > 0.65 (Omega_m h^2/0.1 N)^{0.8} eV at better than
2sigma once microwave background experiments measure two other cosmological
parameters. Significant overlap exists between this region and that implied by
the LSND experiment, and even m_nu ~ 0.01-0.1 eV, as implied by the atmospheric
anomaly, can affect cosmological measurements.
