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The respiratory system is responsible for the intake of oxygen and the release of carbon dioxide.
The International Space Station is a habitable satellite built with the cooperation of 16 countries.
The primary duty of these Japanese warriors was to serve their feudal lords, even at the cost of their own lives.
This animations demonstrates the exterior and interior construction of cars, as well as their operation.
This animation demonstrates the development of the axe throughout archaeological periods.
One of the best known buildings in the world, this is the residence and office of the President of the United States.
The Rutherford Experiment proved the existence of positively charged atomic nuclei. The results led to the elaboration of a new atomic model.
Learning about the geographic location, capitals and flags of the world´s countries through exercises in three levels of difficulty.
The Internet allows us to send data quickly to large distances.
Candles have been used for lighting since ancient times.
A type of steam locomotives used by British Railways were manufactured in the 1950s.
RMS Titanic was the largest passenger ship at the beginning of the 20th century.
A dynamo converts mechanical energy into direct current.
The excellent road and aqueduct system covering the whole empire reflects well the development of the Roman civilisation.
The first supersonic passenger airliner entered service in 1976.
Commercial maritime routes of container ships form a global network.
The ancient city of Babylon was built on the banks of the Euphrates River in Mesopotamia.
The steam engine, perfected by the Scottish engineer James Watt, revolutionised technology.
River locks make rivers with great level differences safe for boating.
The apparent movement of the Sun is caused by the Earth's rotation around its axis.