Number 141 (Story #3), August 25, 1993 by Phillip F. Schewe and Ben Stein THE WORLD IS MADE MOSTLY OF GLUE , according to Nathan Isgur, insofar as the quarks which make up the nucleons which make up atomic nuclei can be thought of as light "bare" quarks endowed with greater mass through the agency of gluons, the carriers of the strong nuclear force. Isgur is the chief theorist at the Continuous Electron Beam Accelerator Facility in Virginia, which will be completed in 1994. At CEBAF 6-GeV (rather than the originally planned 4-GeV) electrons will scatter from nuclei in order to explore an interaction regime not often examined in higher-energy experiments, a regime in which the interaction of quarks through the exchange of gluons and the interaction of nucleons through the exchange of mesons are both important. (Physics Today, August 1993.)