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Demographics – Education – History – Law – Media (Communication) –
Personal life (Category, Portal): Food and drink – Health – Home – People – Pets
Resource Allocation: Automation – Business – Finance – Industries – Organizations
(see also the Idealistic Systems section of Human Systems, above) Applied sciences – Computer science – Heuristics – History of science – Information science – Biology (Ecology) – Mathematics – Methods – Nature – Physical Sciences (Astronomy (Space) – Chemistry – Earth sciences – Physics) – Scientists
Agriculture – Architecture – Big Science – Biotechnology – Chemical processes – Computing – Electronics – Engineering – Internet – Manufacturing – Medicine – Nanotechnology – Nuclear technology – Sound – Telecommunications – Tools – Transport – Vehicles
Christianity – Islam – Agnosticism – Hinduism – Taoism – Buddhism – Paganism (Mythology)
Continents: Africa – Antarctica – Asia – Australia – Europe – North America – Oceania – South America Human Geography: Countries – Cities – Towns – Villages Other: Climate – Landforms – Maps – Parks – Subterranea
By Country – By Period – By Region – By Topic – Historiography – Timelines
