 Harari coined the name of the top and bottom quarks, predicted in 1973 by Kobayashi and Maskawa, and made the first complete statement of the standard six quarks and six leptons model of particle physics (at the Stanford 1975 Lepton-Photon Conference).He also proposed the Rishon Model, a model for a substructure of quarks and leptons, currently believed to be the most fundamental particles in nature.There is no experimental evidence yet for such substructure.