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Pollution is the detrimental effect of human activity on the natural environment.
Viruses consist of protein and DNA or RNA; they reprogram infected cells to produce more viruses.
The round tower of the largest fort in the Arabian Peninsula had an ingenious defence system.
This animation demonstrates different types of volcanic eruptions
Large carnivores, perhaps the best known of dinosaurs.
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 world's most famous citadel, the Acropolis of Athens was built in the 5th century BC, during the Age of Pericles.
This animation presents the formulas to calculate the perimeter and area of shapes as well as the surface area and volume of solids.
The desalination process produces drinking water from seawater.
The most famous and most magnificent amphitheatre of Rome was built in the 1st century.
This animation introduces the most important organ systems of the human body.
This animation demonstrates how the Earth and the Moon were formed.
This animation demonstrates the type of engine most commonly used in cars.
This animation presents some interesting facts in physical geography.
Visit the workshop of the Renaissance polymath and his most influential inventions and works of art.
James Cook's legendary journey around the world proved to be enormously valuable for science.
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.
Banana is one of the most commonly consumed fruits in the world.