[en] The following topics are discussed briefly: Free quarks, Axions, Right-handed charged weak currents, Higgs particles, Top quarks, Generations -sequential heavy leptons, - exotic heavy leptions, - neutrino counting, - familons, Supersymmetric particles, Composite leptons, Magnetic monopoles. The experiments which are reviewed here employ two different methods. One way is to study a known process very precisely. Another way is to plan an experiment or choose analysis parameters in accordance with the predicted characteristics of the particle in order to remove the background. Usually the latter method is sensitive to a few events, but the former can lead to an unexpected surprise. (orig./HSI)