That is, the information is intended to be quickly found when needed. Reference works – compendiums of information, usually of a specific type, compiled in a book for ease of reference.Philosophy – study of general and fundamental questions about existence, knowledge, values, reason, mind, and language.People – plurality of persons considered as a whole, as is the case with an ethnic group or nation.Natural science – branch of science concerned with the description, prediction, and understanding of natural phenomena, based on empirical evidence from observation and experimentation.It evolved through the use of abstraction and logical reasoning, from counting, calculation, measurement, and the systematic study of the shapes and motions of physical objects. Mathematics – the study of topics such as quantity (numbers), structure, space, and change.For instance, it includes leisure, entertainment, industry, recreation, war, and exercise.
Human activities – the various activities done by people.History – the past as it is described in written documents, and the study thereof.Health – state of physical, mental and social well-being.Geography – field of science devoted to the study of the lands, features, inhabitants, and phenomena of the Earth and planets.Culture – encompasses the social behavior and norms found in human societies, as well as the knowledge, beliefs, arts, laws, customs, capabilities and habits of the individuals in these groups.Wikipedia's main navigation subsystems ( overviews, outlines, lists, portals, glossaries, categories, and indices) are each divided into the following subject classifications:
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