[en] Even though physicists have established the presumed correct theory of strong interactions, QCD, calculation of the partonic structure of hadrons remains beyond our present capability. Those of us who measure these partonic distributions are anxious to learn at this workshop, of the progress being made in carrying out the theory in the light cone reference frame. In this talk I will present results from a direct measurement (FNAL/E866/BUSEA) of the relative d-bar,u-bar content of nucleon sea and discuss perspectives on the origin of the observed flavor asymmetry. (AIP)