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Open-cast mine

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

Medieval farmhouse

Farmhouses in the Middle Ages were simple, single-storey structures built from earth, mud and wood.

Time zones

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

Medical conditions of the spine

Scoliosis is a medical condition in which a person's spine has a lateral deviation.

Muscles of the upper arm

The arms are moved by flexor and extensor muscles.

Platonic solids

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

Junction

Entertaining and spectacular animation to practise orientation in space.

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.

Conic sections

The conic section is a plane curve that is created when a right circular cone is intersected by a plane.

Otto Lilienthal’s glider

The German engineer Otto Lilienthal was the first person to make successful flights with a glider designed by himself.

Fuel cell

A fuel cell provides environment-friendly electric energy produced by the chemical reaction between oxygen and hydrogen.

Shale gas

This animation explains the technology of shale gas extraction.

Medieval keep

Keeps were typical buildings in the Middle Ages, also built independently from castles.

Bones of the lower limbs

Bones of the lower limbs are connected to the trunk by the pelvis.

Road transport, articulated lorry

Articulated lorries play an important role in road transport.

Diversity of light-detecting organs

Several analogous types of eyes have developed independently through convergent evolution.

Soldiers of the American Civil War

The American Civil War was fought between the Confederacy and the Union.

Phonograph and gramophone

Edison´s invention records and plays sound from a cylinder, while Berliner´s apparatus uses a disc.

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