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In loudspeakers sound waves are generated by electromagnetic induction.
A symbol of division and oppression, the Wall tore a city and numerous families apart.
The Buddhist pagoda of the six Harmonies is located in China, by the River Qiantang.
Medieval townhouses were built from stone or brick and were several storeys high.
This animation demonstrates the internal structure of the brain.
Lymph vessels carry lymph to the blood vessels, while lymph nodes are integral parts of the immune system.
The animation shows the two-seater Lunar Rover used in the Apollo 15 mission
Life magazine picked Gutenberg's invention of mechanical movable type printing as the most important event of the second millennium.
The diameter of the Sun is about 109 times that of the Earth. Most of its mass consists of hydrogen.
Designated as the first National Treasure of South Korea, the Namdaemun was one of the major gateways of Seoul's Medieval city walls.
The Earth is composed of several spherical layers.
The orbits of the 8 planets in our Solar System are elliptical.
Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes continuously changes during the year.
The geographic coordinate system enables every location on the Earth to be exactly specified.
This animation shows the characteristics of domestic light sources, from traditional light bulbs to LED lights.
Eukaryotic cells contain a number of organelles.
The atomic bomb is one of the most destructive weapons in human history.
Medieval Syrian water wheels were used to convey water to distant areas.
The primary duty of these Japanese warriors was to serve their feudal lords, even at the cost of their own lives.
The largest bronze-age building complex of ancient Crete was probably the centre of Minoan civilisation.