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The dreaded warriors of the Mongol Empire helped to make it one of the largest empires in history.
The fortress of Oradea in Transylvania is a good example of medieval fortress architecture.
An exercise about the generation of solids of revolution.
Pollen serves to fertilise the egg of plants. Pollen grains come in a variety of shapes and sizes, characteristic of the species.
This animation demonstrates the use of modern technology in agriculture.
The theorem formulated by Leonhard Euler describes one of the basic properties of convex polyhedra.
The California Gold Rush started in 1848, near San Francisco.
One of the most important battles of World War II proved to be a turning point of the War in the Pacific
This animation demonstrates how sonar works.
Colourless, odourless gas used as a standard in NMR spectroscopy.
A basic heterocyclic organic compound; a colourless, pungent toxic liquid.
This animation presents the regions, counties and cities of Hungary.
A colourless, toxic gas with the characteristic odour of rotten eggs. It occurs in certain mineral waters and spring waters.
It is also used as a food additive, limescale and rust remover.
A colourless gas with a pungent odour. It is widely used in industry.
The first member in the homologous series of 1-alkenes.
A colourless, heavier-than-air gas. Its geometric isomer is trans-2-butene.
The first member of the homologous series of alkyne hydrocarbons.
A reddish-brown toxic gas, very reactive due to its unpaired electron.
A liquid with a characteristic unpleasant odour and a low boiling point.