  The correlations of the decay products following the beta decay of nuclei
have a long history of providing a low-energy probe of the fundamental
symmetries of our universe. Over half a century ago, the correlation of the
electrons following the decay of polarized 60Co demonstrated that parity is not
conserved in weak interactions. Today, the same basic idea continues to be
applied to search for physics beyond the standard model: make precision
measurements of correlation parameters and look for deviations compared to
their standard model predictions. Efforts to measure these parameters to the
0.1% level utilizing atom and ion trapping techniques are described.
