  Light-Front Quantization -- Dirac's "Front Form" -- provides a physical,
frame-independent formalism for hadron dynamics and structure. Observables such
as structure functions, transverse momentum distributions, and distribution
amplitudes are defined from the hadronic LFWFs. One obtains new insights into
the hadronic mass scale, the hadronic spectrum, and the functional form of the
QCD running coupling in the nonperturbative domain using light-front
holography. In addition, superconformal algebra leads to remarkable
supersymmetric relations between mesons and baryons. I also discuss evidence
that the antishadowing of nuclear structure functions is non-universal, i.e.,
flavor dependent, and why shadowing and antishadowing phenomena may be
incompatible with the momentum and other sum rules for the nuclear parton
distribution functions.
