Number 90 (Story #2), August 4, 1992 by Phillip F. Schewe and Ben Stein ACTIVITY AT ACCELERATORS around the world: At HERA in Hamburg, 27-GeV electrons and 820-GeV protons were colliding as of June 1. The initial luminosity was 1.5 x 10**27 particles per sec per sq cm. At Stanford's SLC, electron beams with polarizations at high as 25% were colliding with positrons. Polarizations of 46% are expected by the end of the year. Meanwhile, at the Beijing Electron-Positron Collider (BEPC) a new value for the mass of the tau lepton (1776.9 MeV) has been obtained with ten times the precision of previous measurements. (CERN Courier, July 1992.)