American soldiers fought in almost all major theatres of World War II.
A compound ion produced from carbonic acid by releasing protons.
Colour a map with the fewest number of colours possible, so that no two adjacent regions have the same colour.
A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.
This animation demonstrates birds' bones and eggs through the example of the common blackbird.
The California Gold Rush started in 1848, near San Francisco.
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 flats characterise the culture of the decade.
Remnants of Ottoman architecture in Hungary include the Gazi Kasim Pasha Mosque in Pécs and the Minaret of Eger.
Colouring the vertices, edges and faces of a given cube according to the criteria specified in the exercise.
The Canadian helicopter is one of the most widely used helicopters in the world.
Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.
This animation demonstrates how lifts work.
This animation demonstrates how sonar works.
Pollen serves to fertilise the egg of plants. Pollen grains come in a variety of shapes and sizes, characteristic of the species.
Subterranean rodents widespread in Central- and Eastern Europe.
The small passenger aircraft is designed for speed, convenience and economical operation.
The Jumbo Jet is one of the best known airliners.
Maharajas were Hindu rulers of large regions of India.
The best-known piece of the Hungarian Crown Jewels is the Holy Crown.