  In 2004, two of us proposed a texture, the "Simplest" neutrino mass matrix,
which predicted sin(theta13)=sqrt((2 Solar-Delta m^2)/(3 Atm-Delta m^2)) and
delta_CP=90 degrees. Using today's measured values for neutrino mass-squared
differences, this prediction gives sin^2(theta13)~0.086+0.003-0.006, compared
with a measured value, found by averaging the results of the Daya Bay and RENO
experiments, of sin^2(theta13)=0.093+0.010-0.010. Here we present a specific
model based on S4 symmetry leading to this successful texture in the context of
the type-1 see-saw mechanism, assuming Majorana neutrinos. In this case,
slightly different predictions are obtained relating theta13 to the light
neutrino masses, which are in accord with current experimental limits and
testable at future experiments. Large CP asymmetries remain a generic
prediction of the texture.
