American soldier (World War II)

American soldiers fought in almost all major theatres of World War II.

Carbonate ion (CO₃²⁻)

A compound ion produced from carbonic acid by releasing protons.

Four colour theorem

Colour a map with the fewest number of colours possible, so that no two adjacent regions have the same colour.

Nitrogen (N₂) (intermediate)

A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.

Common blackbird

This animation demonstrates birds' bones and eggs through the example of the common blackbird.

Gold mining (19th century)

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

The castle of Eger (16th century)

The castle of Eger got its final shape and became an important component in the new chain of border forts in the 16th century.

Typical flat in Hungary in the 1980s

Typical flats characterise the culture of the decade.

Ottoman architecture in Hungary (17th century)

Remnants of Ottoman architecture in Hungary include the Gazi Kasim Pasha Mosque in Pécs and the Minaret of Eger.

Colouring a cube

Colouring the vertices, edges and faces of a given cube according to the criteria specified in the exercise.

Helicopter (BELL 206 Jet Ranger)

The Canadian helicopter is one of the most widely used helicopters in the world.

Carbon dioxide (CO₂) (intermediate)

Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.

Pollen

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

European ground squirrel

Subterranean rodents widespread in Central- and Eastern Europe.

Bombardier CRJ200 (1991)

The small passenger aircraft is designed for speed, convenience and economical operation.

Boeing 747 (1969)

The Jumbo Jet is one of the best known airliners.

The Hungarian Crown Jewels

The best-known piece of the Hungarian Crown Jewels is the Holy Crown.

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