id author title date pages extension mime words sentences flesch summary cache txt en-wikipedia-org-5305 Human science - Wikipedia .html text/html 3113 361 43 However, even with regard to the natural sciences, significant difference exist among scientists and philosophers of science with regard to what constitutes valid scientific method[3][page needed]—for example, evolutionary biology, geology and astronomy, studying events that cannot be repeated, can use a method of historical narratives.[4] More recently, usage of the term has been extended to the study of human social phenomena. Thus, natural and social sciences are commonly classified as science, whereas the study of classics, languages, literature, music, philosophy, history, religion, and the visual and performing arts are referred to as the humanities. The term moral science was used by David Hume (1711-1776) in his Enquiry concerning the Principles of Morals to refer to the systematic study of human nature and relationships. Since Auguste Comte, the positivistic social sciences have sought to imitate the approach of the natural sciences by emphasizing the importance of objective external observations and searching for universal laws whose operation is predicated on external initial conditions that do not take into account differences in subjective human perception and attitude. ./cache/en-wikipedia-org-5305.html ./txt/en-wikipedia-org-5305.txt