or log in
The church of the "Holy Wisdom," built in the Byzantine Empire, had been one of the...
This animation presents the formulas to calculate the perimeter and area of shapes as...
The desalination process produces drinking water from seawater.
This animation demonstrates the type of engine most commonly used in cars.
This animation demonstrates different types of volcanic eruptions.
This animation introduces the most important organ systems of the human body.
Large carnivores, perhaps the best known of dinosaurs.
This animation demonstrates how the Earth and the Moon were formed.
Visit the workshop of the Renaissance polymath and his most influential inventions and...
The ear converts the vibrations of air into electric signals which are then processed by...
The world's most famous citadel, the Acropolis of Athens was built in the 5th century...
The most famous and most magnificent amphitheater of Rome was built in the 1st century.
A hydrothermal vent is a fissure in the planet's surface from which geothermally heated...
The Panama Canal is an artificial waterway created to shorten shipping routes between the...
The Suez Canal is an artificial waterway connecting the Red Sea and the Mediterranean Sea.
A selection of legendary buildings from the history of civilisation.
There are various types of instruments used for measuring temperature.
A presentation of the major administrative units of China.
The American bison is the largest land animal in North America.
An introduction to the relief and hydrography of China.