The development of television sets

Television, invented in the early 20th century, became one of the basic forms of entertainment.

German soldier (World War I)

German sordiers in the First World War were well trained and used modern weapons.

British soldier (World War I)

During World War I, Britain was part of the military alliance called the ´Triple Entente´.

Surface area of spheres (demonstration)

The surface of a sphere consists of the set of points which are all at the same distance from a given point in space.

Macedonian phalangite (4th century BC)

Soldiers of the ancient Macedonian Kingdom were dreaded warriors.

Market town (Kingdom of Hungary)

Market towns became the most common type of towns in the Kingdom of Hungary by the Late Middle Ages.

Volume of spheres (Cavalieri´s principle)

Calculating the volume of a sphere is possible using an appropriate cylinder and cone.

Nitrogen (N₂) (intermediate)

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

Arab Caliph (7th century)

Caliphs, considered successors of the Prophet Muhammad, were the most important religious leaders of Islam.

Persian monarch (5th century BC)

Ancient Persian monarchs were famous for the size of their empire and their wealth.

American soldier (World War II)

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

Four color theorem

Color a map with the fewest number of colors possible, so that no two adjacent regions have the same color.

Common blackbird

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

Coenzyme A

An acyl-carrier coenzyme taking part in both anabolic and catabolic processes.

Gold mining (19th century)

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

Carbonate ion (CO₃²⁻)

A compound ion produced from carbonic acid by releasing protons.

Egyptian Pharaoh and his wife (2nd millennium B.C.)

Egyptian Pharaohs were respected as gods, they were lords of life and death.

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.

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.

Coloring a cube

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

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