Cortical organisation of speech

Producing speech requires the synchronised operation of several cortical centres.

Vision correction

Concave and convex lenses are used for the correction of short-sightedness and far-sightedness.

Chengdu J-20 Mighty Dragon (China, 2017)

The Chengdu J-20, also known as Mighty Dragon, is a multiple function stealth fighter aircraft.

Colonisation and decolonisation

The colonising powers´ colours were wiped off the map by the nations fighting to regain their independence.

Time zones

The Earth is divided into 24 time zones. Standard time is the time used within time zones.

Tidal power station

Tidal power stations utilise the daily fluctuation of the water level for producing electricity.

Open-cast mine

As opposed to underground mines, in open-pit mines the layers covering coal are removed, coal is extracted on the surface.

Sewage treatment plant

Treated sewage water can be used in agriculture and industry.

Ferrous metallurgy (intermediate)

Raw iron is produced from iron ore in iron smelters.

English battleship (18th century)

English sailing ships were among the best ships in the 17th-19th centuries.

Ictíneo II submarine

The submarine designed by the Spanish inventor Narcís Monturiol was a pioneering work in the history of underwater navigation.

House without carbon-dioxide emission

The design and structure of modern houses play an important role in environmental protection.

Measuring time

The first calendars and time-measuring instruments were already used by ancient Eastern civilisations.

Tutankhamun’s tomb (14th century BC)

One of the greatest archaeological finds of the 20th century was the tomb of the Egyptian pharaoh.

The history of aviation

The animation offers a summary of the history of aviation from the Middle Ages.

Battle of Salamis (480 BC)

The Greek fleet owed their success to their good tactics and their fast and easily manoeuvrable ships.

Auschwitz-Birkenau concentration camp

More than one million people died in the WWII Nazi death camp located in present-day Poland.

Platonic solids

This animation demonstrates the five regular three-dimensional (or Platonic) solids, the best known of which is the cube.

Cube (exercises)

Edges, diagonals and faces of a cube can be identified by its vertices.

Non-orientable surfaces

The Möbius strip and the Klein bottle are special two-dimensional surfaces with only one side.

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