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Mongol warrior (13th century)

The dreaded warriors of the Mongol Empire helped to make it one of the largest empires in history.

The fortress of Oradea (1775)

The fortress of Oradea in Transylvania is a good example of medieval fortress architecture.

Solids of revolution (exercise)

An exercise about the generation of solids of revolution.

Pollen

Pollen serves to fertilise the egg of plants. Pollen grains come in a variety of shapes and sizes, characteristic of the species.

Precision agriculture

This animation demonstrates the use of modern technology in agriculture.

Euler's polyhedron formula

The theorem formulated by Leonhard Euler describes one of the basic properties of convex polyhedra.

Gold mining (19th century)

The California Gold Rush started in 1848, near San Francisco.

Battle of Midway (1942)

One of the most important battles of World War II proved to be a turning point of the War in the Pacific

2,2 dimethylpropane (C₅H₁₂)

Colourless, odourless gas used as a standard in NMR spectroscopy.

Pyridine (C₅H₅N)

A basic heterocyclic organic compound; a colourless, pungent toxic liquid.

Administrative divisions of Hungary

This animation presents the regions, counties and cities of Hungary.

Hydrogen sulphide (H₂S)

A colourless, toxic gas with the characteristic odour of rotten eggs. It occurs in certain mineral waters and spring waters.

Phosphoric acid (H₃PO₄)

It is also used as a food additive, limescale and rust remover.

Dimethylamine (NH(CH₃)₂)

A colourless gas with a pungent odour. It is widely used in industry.

Ethene (ethylene) (C₂H₄)

The first member in the homologous series of 1-alkenes.

Cis-2-butene (C₄H₈)

A colourless, heavier-than-air gas. Its geometric isomer is trans-2-butene.

Ethyne (acetylene) (C₂H₂)

The first member of the homologous series of alkyne hydrocarbons.

Nitrogen-dioxide (NO₂)

A reddish-brown toxic gas, very reactive due to its unpaired electron.

Pent-1-ene (C₅H₁₀)

A liquid with a characteristic unpleasant odour and a low boiling point.

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