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Intellectual information systems, their types and functions

Options society

Tesla Turbine - simple and beautiful solution to a technical problem

Eukaryotic cells and its structural and functional organization

The individual - a person?

What is the state?

The first people: hypotheses, theories, evidence

Phosphoric acid, its physicochemical properties and applications

Regular hexagon: the more it is interesting and how to build it

Individual development of the organism.

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