The heart generates the electrical impulses necessary for its own operation. The graphic representation of the electrical activity of the heart is the...
The name of this magnificent palace complex originates in Arabic and means 'the red one'.
The respiratory system is responsible for the intake of oxygen and the release of carbon dioxide.
The eye is one of our most important sense organs. When stimulated by light, electric impulses are produced by its receptors.
A type of steam locomotives used by British Railways were manufactured in the 1950s.
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.
This animation demonstrates the development of the axe throughout archaeological periods.
Lightning is a sudden electrostatic discharge accompanied by a sound known as thunder.
Bottlenose dolphins are sea mammals which use ultrasound for orientation.
This animation introduces the most important systems of the human body.
This animation demonstrates the functioning of the 3 basic types of water tap.
This animations demonstrates the exterior and interior construction of cars, as well as their operation.
Candles have been used for lighting since ancient times.
One of the directors of the circular, open-air Renaissance theatre in London was William Shakespeare.
An average Egyptian dwelling consisted of regularly arranged rooms.
The steam engine, perfected by the Scottish engineer James Watt, revolutionised technology.
The apparent movement of the Sun is caused by the Earth's rotation around its axis.
River locks make rivers with great level differences safe for boating.