  The explanatory strategy here is quite unlike the usual one encountered in statistical mechanics and shows incisively how the specifics of the physical systems crying out for explanation in science can require the introduction of new methodological ploys if full understanding is to be obtained.  In this the introduction of these renormalization group methods resembles the way in which the need to an atomistic account of macroscopic thermodynamic behavior itself required the new methods of statistical mechanics to be added to the older repertoire of typical dynamical explanations.