The length scales for QCD and for nuclear physics are about the same,
both about 1 fermi, and this directly motivates a search for a QCD exp
lanation of nuclear phenomena, beginning with the deuteron. We first r
eview the theoretical tools and results relevant to nuclear QCD, and t
hen discuss data for several reactions. In particular, the remarkable
data on deuteron photodisintegration agree with the naive perturbative
QCD predictions for their scaling behavior and disagree with predicti
ons from traditional approaches. This may be the first distinctive sig
nature wherein considering the quark substructure in a nucleus is cruc
ial in explaining some phenomenon.