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The universal anomalies in the normal state of Cu-0 high-temperature superconductors follow from a single hypothesis: There exist chargeand spin-density excitations with the absorptive part of the polarizability at low frequencies co proportional to co/T, where T is the temperature, and constant otherwise. The behavior in such a situation may be characterized as that of a marginal Fermi liquid. The consequences of this hypothesis are worked out for a variety of physical properties including superconductivity.PACS numbers: 74.70.VyThe normal-state properties of the Cu-0 superconductors are as perplexing as their high transition temperatures. The electrical resistivity p(T), ' the thermal conductivity x(T), the optical conductivity cr(co), the Raman scattering intensity S(ro), the tunneling conductance as a function of voltage g(V), the nuclear relaxation rate T~' (T), and the Hall coefficient RH(T) (Ref.

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