  Physics is an experimental science; and a constructive feedback between
theory and extant and forthcoming experiments is necessary if an understanding
of nonperturbative QCD is to be achieved. The Dyson-Schwinger equations connect
confinement with dynamical chiral symmetry breaking, both with the observable
properties of hadrons, and hence can plausibly provide a means of elucidating
the empirical content of strong QCD. We illustrate these points via comments
on: in-hadron condensates; dressed-quark anomalous chromo- and electro-magnetic
moments; the self-limiting magnitudes of such moments and pion-loop
contributions to the gap equation; deep inelastic scattering; the spectra of
mesons and baryons; the critical role played by hadron-hadron interactions in
producing these spectra; and nucleon elastic and transition form factors.
