Reference works – compendiums of information, usually of a specific type, compiled in a book for ease of reference. That is, the information is intended to be quickly found when needed.
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.
Geography – field of science devoted to the study of the lands, features, inhabitants, and phenomena of the Earth and planets.
Health – state of physical, mental and social well-being.
History – the past as it is described in written documents, and the study thereof.
Human activities – the various activities done by people. For instance, it includes leisure, entertainment, industry, recreation, war, and exercise.
Mathematics – the study of topics such as quantity (numbers), structure, space, and change. 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.
Natural science – branch of science concerned with the description, prediction, and understanding of natural phenomena, based on empirical evidence from observation and experimentation.
People – plurality of persons considered as a whole, as is the case with an ethnic group or nation.
Philosophy – study of general and fundamental questions about existence, knowledge, values, reason, mind, and language.
Religions – social-cultural systems of designated behaviors and practices, morals, worldviews, texts, sanctified places, prophecies, ethics, or organizations, that relates humanity to supernatural, transcendental, or spiritual elements.
Society – group of individuals involved in persistent social interaction, or a large social group sharing the same geographical or social territory, typically subject to the same political authority and dominant cultural expectations.