  Quasielastic electromagnetic and parity-violating electron scattering
response functions of relativistic nuclear matter are reviewed. The roles
played by the Hartree-Fock field and by nuclear correlations in the Random
Phase Approximation (treated within the continued fraction scheme) are
illustrated. The parity-violating responses of nuclei to polarized electrons
are also revisited, stressing in particular the crucial role played by the pion
in the nuclear dynamics. Finally, some issues surrounding scaling and sum rules
are addressed.
