E.O. Wilson in Consilience: The Unity of Knowledge:

Everyone knows that the social sciences are hypercomplex.  They are inherently far more difficult than physics and chemistry, and as a result they, not physics and chemistry, should be called the hard sciences.  They just seem easier, because we can talk with other human beings but not with photons, gluons, and sulfide radicals.  Consequently, too many social-science textbooks are a scandal of banality.