Number 251 (Story #3), December 7, 1995 by Phillip F. Schewe and Ben Stein 140-GeV INTERACTIONS AT LEP . The upgraded Large Electron Positron (LEP) collider at CERN last month achieved the highest collision energy yet for an electron-positron machine. By 1998, the energy should reach 196 GeV. Working in a new energy regime, particle physicists are always eager to find something new, such as supersymmetric particles. According to supersymmetry theory, all fermions (such as electrons and quarks) would have boson counterparts and vice versa. (Science, 24 November 1995.)