  The dichotomy of the pion as QCD's Goldstone mode and a bound state of
massive constituents is easily understood using the Dyson-Schwinger equations.
That provides the foundation for an efficacious phenomenology, which correlates
the pion's charge radius and electromagnetic form factor with its valence quark
distribution function; and simultaneously provides a Poincare' covariant
description of the nucleon, its form factors and, more recently, meson
photoproduction processes. This well-constrained framework can also be used to
eliminate candidates for an extension of the Standard Model by providing the
relation between current-quark electric dipole moments and that of the neutron
