  We discuss a new method to extract neutrino signals in low energy
experiments. In this scheme the symmetric nature of most backgrounds allows for
direct cancellation from data. The application of this technique to the Palo
Verde reactor neutrino oscillation experiment allowed us to reduce the
measurement errors on the anti-neutrino flux from $\sim 20$% to $\sim 10$%. We
expect this method to substantially improve the data quality in future low
background experiments such as KamLAND and LENS.
