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Milestones of scientific discoveries - the Pauli principle

The theory of electrolytic dissociation.

Le Chatelier's principle: a scientific breakthrough of the 18th century

Dirichlet's principle.

Heterogeneous or heterogeneous systems

Potassium nitrate and its application

Harmonic oscillations of the oscillatory process and schedule

What are minerals?

Amoeba ordinary, its habitat, especially the structure and functioning

Organic matter their characteristics and classification

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The son of the leader - Vasily Stalin: A Biography, personal life
The birth of democracy in Athens.
In what year Brezhnev died?