Pollution is the detrimental effect of human activity on the natural environment.
This animation introduces the most important organ systems of the human body.
The desalination process produces drinking water from seawater.
This animation presents the formulas to calculate the perimeter and area of shapes as well as the surface area and volume of solids.
The most famous and most magnificent amphitheater of Rome was built in the 1st century.
This animation demonstrates different types of volcanic eruptions.
The round tower of the largest fort in the Arabian Peninsula had an ingenious defense system.
This animation demonstrates how the Earth and the Moon were formed.
The ear converts the vibrations of air into electric signals which are then processed by the brain.
The world's most famous citadel, the Acropolis of Athens was built in the 5th century B.C., during the Age of Pericles.
Large carnivores, perhaps the best known of dinosaurs.
This animation demonstrates the type of engine most commonly used in cars.
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.
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.
The animation shows the traditional Japanese wooden townhouse, the machiya.
While generators convert mechanical energy into electrical energy, electric motors convert electrical energy into mechanical energy.
Physical properties, as well as the flora and fauna of the ocean change with depth.