§04§An approach to the unification of elementary particle interactions.- Composite quarks and leptons.- Radical unification.- Speculations about the QCD vacuum.- Some recent progress in chromo string dynamics.- The numerical study of quantum chromodynamics.- Spontaneously broken and dynamically enhanced global and local symmetries.- Spontaneous breaking of supersymmetry.- Supersymmetric soliton states in extended supergravity theories.- Stability properties of gravity theories.- Why is the apparent cosmological constant zero?.- Lattice gravity or Riemannian structure on piecewise linear spaces.- Particles and geometry.
