Pollution is the detrimental effect of human activity on the natural environment.
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 the formulas to calculate the perimeter and area of shapes as well as the surface area and volume of solids.
The round tower of the largest fort in the Arabian Peninsula had an ingenious defense system.
The ear converts the vibrations of air into electric signals which are then processed by the brain.
The most famous and most magnificent amphitheater of Rome was built in the 1st century.
The desalination process produces drinking water from seawater.
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 B.C., during the Age of Pericles.
This animation demonstrates different types of volcanic eruptions.
Large carnivores, perhaps the best known of dinosaurs.
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.
The main sources of water pollution are industry, agriculture and urban areas.
Reindeer are the northernmost deer species.
This animation introduces body parts on a male anatomical model.
This animation demonstrates the anatomy of spiders through the example of a common European species.
The respiratory system is responsible for the intake of oxygen and the release of carbon dioxide.