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Pollution is the detrimental effect of human activity on the natural environment.
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 the type of engine most commonly used in cars.
Large carnivores, perhaps the best known of dinosaurs.
This animation demonstrates different types of volcanic eruptions.
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.
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.
Neil Armstrong, one of the crew members of Apollo 11 was the first man to set foot on the Moon.
This animation introduces the most important organ systems of the human body.
The most famous and most magnificent amphitheater of Rome was built in the 1st century.
The round tower of the largest fort in the Arabian Peninsula had an ingenious defense system.
Located in the Grand Mosque of Makkah, the Kaaba shrine is the most sacred site of Islam.
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.
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.
The main sources of water pollution are industry, agriculture and urban areas.
Reindeer are the northernmost deer species.
The Benz Patent-Motorwagen is widely regarded as the first vehicle propelled by an internal combustion engine.