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Pollution is the detrimental effect of human activity on the natural environment.
The desalination process produces drinking water from seawater.
The ear converts the vibrations of air into electric signals which are then processed by the brain.
The church of the 'Holy Wisdom', built in the Byzantine Empire, had been one of the largest religious buildings until 1935, when it was converted into a museum.
The round tower of the largest fort in the Arabian Peninsula had an ingenious defence system.
This animation demonstrates how the Earth and the Moon were formed.
Large carnivores, perhaps the best known of dinosaurs.
This animation demonstrates different types of volcanic eruptions
The most famous and most magnificent amphitheatre of Rome was built in the 1st century.
The world's most famous citadel, the Acropolis of Athens was built in the 5th century BC, during the Age of Pericles.
This animation introduces the most important organ systems of the human body.
This animation demonstrates the type of engine most commonly used in cars.
This animation presents the formulas to calculate the perimeter and area of shapes as well as the surface area and volume of solids.
Visit the workshop of the Renaissance polymath and his most influential inventions and works of art.
This animation presents some interesting facts in physical geography.
James Cook's legendary journey around the world proved to be enormously valuable for science.
The Bell X-1 was the first manned aircraft to exceed the speed of sound in level flight.
The Forbidden City is one of the most magnificent and mysterious monuments of imperial China.
The scene depicts the extremities of the Victorian era, presenting the throne room and a workhouse.
The main sources of water pollution are industry, agriculture and urban areas.