This animation demonstrates how muscles and vertebrae move the head.
Radial engines are used primarily in aeroplanes and helicopters.
Modern Slavs live in 14 European countries that can be classified into 3 groups.
Cosmopolitan monocots inhabiting watersides.
A presentation of the major administrative units of China.
Practise the German alphabet and form words from the letters.
Practise the English alphabet, build words from letters.
Practise the Russian alphabet, build words from letters.
Cossacks, members of independent semi-military communities, played an important role in the history of Ukraine.
This 3D scene explains the correlation between the ratio of similarity and the ratio of volume of geometric solids.
There are various types of instruments used for measuring temperature.
The American bison is the largest land animal in North America.
The mosque, built in a distinctive architectural style, is the largest adobe structure in the world.
There are two basic cell types: prokaryotic and eukaryotic cells.
The adrenal glands are responsible for maintaining homeostasis and producing a rapid response in stressful situations.
This 3D scene presents the flora and fauna of the last period of the Palaeozoic Era.
Frank Lloyd Wright's well-known work is a masterpiece of modern organic architecture.
This scene presents the location, anatomy and functioning of the central organ of the human circulatory system.
This 3D scene presents the steps of the cement manufacturing process.
The vacuum cleaner creates a partial vacuum and sucks up dust with the help of the incoming high-pressure air.