Development of television sets.

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

German soldier (World War I)

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

Surface area of spheres (demonstration)

The surface of a sphere consists of the set of points which are all at the same distance...

British soldier (World War I)

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

The Hungarian army in the 15th century (cavalry)

One of the main units of Matthias Corvinus´ Black Army was the cavalry.

Alkanes

Alkanes are saturated hydrocarbons which can be organized into a homologous series.

Battle of Alesia (52 BC)

The Gaul city Alesia, which was defended by Vercingetorix, was besieged by the Roman...

Macedonian phalangite (4th century BC)

Soldiers of the ancient Macedonian Kingdom were dreaded warriors.

Battle of Midway (1942)

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

Flood defense system

The protective embankment, or, in case of minor floods, the summer dike ensures the...

How does it work? - Water tower

This animation demonstrates the structure of water towers.

Medieval knight

Before the appearance of firearms medieval battles were often decided by armored knights.

Knights’ hall

One of the most important parts of a medieval castle was the Knights´ hall.

Late Roman soldier (4th century)

The prosperity of the eastern part of the Roman Empire started in the early 4th century,...

Volume of spheres (Cavalieri´s principle)

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

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

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

Ottoman architecture in Hungary (17th century)

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

Coloring a cube

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

The reproduction and development of insects

Based on their life cycle, insects can be grouped into three categories: ametabolous,...

Gold mining (19th century)

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

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