Linear Response and Equilibrium Dynamics.- Liouvillian Representation.- Hamiltonian Representation.- Genetic Code of Spectral Densities.- Recursion Method Illustrated.- Universality Classes of Dynamical Behavior.- Termination of Continued Attempts at Damage Control.- Reconstruction of Spectral Densities from Incomplete Continued Fractions.- Transport of Spin Fluctuations at High Temperature.- Quantum Spin Dynamics at Zero Temperature.