  Nuclear pasta, with non-spherical shapes, is expected near the base of the
crust in neutron stars. Large scale molecular dynamics simulations of pasta
show long lived topological defects that could increase electron scattering and
reduce both the thermal and electrical conductivities. We model a possible low
conductivity pasta layer by increasing an impurity parameter Q_{imp}.
Predictions of light curves for the low mass X-ray binary MXB 1659-29, assuming
a large Q_{imp}, find continued late time cooling that is consistent with
Chandra observations. The electrical and thermal conductivities are likely
related. Therefore observations of late time crust cooling can provide insight
on the electrical conductivity and the possible decay of neutron star magnetic
fields (assuming these are supported by currents in the crust).
