The geographic coordinate system enables every location on the Earth to be exactly specified.
Medieval townhouses were built from stone or brick and were several storeys high.
This animation introduces the most important systems of the human body.
The difference between the temperature of the polar and equatorial zones causes atmospheric circulation which is affected by a number of factors, including...
The International Space Station is a habitable satellite built with the cooperation of 16 countries.
Bottlenose dolphins are sea mammals which use ultrasound for orientation.
The eye is one of our most important sense organs. When stimulated by light, electric impulses are produced by its receptors.
The pancreas and the liver empty digestive juices into the duodenum.
Lymph vessels carry lymph to the blood vessels, while lymph nodes are integral parts of the immune system.
Eukaryotic cells contain a number of organelles.
This animation demonstrates the functioning of the 3 basic types of water tap.
A symbol of division and oppression, the Wall tore a city and numerous families apart.
The atomic bomb is one of the most destructive weapons in human history.
This animation demonstrates the internal structure of the brain.
The three important laws describing planetary motion were formulated by Johannes Kepler.
The ribs, the sternum and the spinal column form the skeleton of the chest.
The largest bronze-age building complex of ancient Crete was probably the centre of Minoan civilisation.
The name of this magnificent palace complex originates in Arabic and means 'the red one'.
This animation shows the characteristics of domestic light sources, from traditional light bulbs to LED lights.
The heart generates the electrical impulses necessary for its own operation. The graphic representation of the electrical activity of the heart is the...