Number 71 (Story #4), March 13, 1992 by Phillip F. Schewe and Ben Stein B FACTORIES WILL NOT BE BUILT , according to new DOE and NSF budget reports. Particle physicists at Stanford and Cornell had sought to build electron-positron colliders dedicated to producing B mesons, whose decays, it is thought, would provide valuable information about the little-understood violation of CP invariance.