  Weinberg's dimensional power counting for nuclei is reprised in this primer.
The role of QCD and chiral symmetry in constructing effective Lagrangians is
discussed. The two-scale hypothesis of Manohar and Georgi is combined with
power counting in amplitudes to shed light on the scales of nuclear kinetic and
potential energies, the size of strong-interaction coupling constants, the size
of meson-exchange currents, and the relative sizes of $N$-nucleon forces.
Numerous examples are worked out and compared to conventional nuclear models.
