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The three important laws describing planetary motion were formulated by Johannes Kepler.
The atomic bomb is one of the most destructive weapons in human history.
Our gametes are haploid cells produced from diploid cells by meiosis, a special type of cell division.
A wooden church built in the 12th-13th centuries, the best preserved of Norway´s stave churches.
A hydrothermal vent is a fissure in the planet's surface through which geothermally heated water erupts.
The apparent movement of the Sun is caused by the Earth's rotation around its axis.
The Troll A is an offshore natural gas platform, the largest offshore platform ever built: it rises about 170 metres above water level, weighs 656,000...
Medieval Syrian water wheels were used to convey water to distant areas.
A symbol of division and oppression, the Wall tore a city and numerous families apart.
Lightning is a sudden electrostatic discharge accompanied by a sound known as thunder.
Learning about the geographic location, capitals and flags of the world´s countries through exercises in three levels of difficulty.
One of the best known buildings in the world, this is the residence and office of the President of the United States.
A dynamo converts mechanical energy into direct current.
The Rutherford Experiment proved the existence of positively charged atomic nuclei. The results led to the elaboration of a new atomic model.
Aluminium smelting is the process of extracting aluminium from alumina by electrolysis.
This animation demonstrates the functioning of the 3 basic types of water tap.
This animation introduces the most important systems of the human body.
Bottlenose dolphins are sea mammals which use ultrasound for orientation.
Located close to Osaka, the Japanese castle is also called the White Heron because of its white exterior.
Bacteria occur in a wide range of shapes, including spheres, rods and spirals.