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Modern Slavs live in 14 European countries that can be classified into 3 groups.
Learning about the geographic location, capitals and flags of European countries through exercises in three levels of difficulty.
A blood clot that forms in the deep veins of the lower limbs can cause a fatal pulmonary embolism if it enters the lungs.
Capacitors store electrical energy in the form of electric charge.
One of the most common tree of the pine family, native to Eurasia.
The axolotl, also known as Mexican salamander, is an amphibian species that keeps its gills even in adulthood.
Numerous legendary empires were built (and destroyed) in the course of history.
Numerous legendary empires were built (and destroyed) in the course of history.
Numerous legendary empires were built (and destroyed) in the course of history.
The animation offers a summary of the history of aviation from the Middle Ages.
This 3D scene explains the correlation between the ratio of similarity and the ratio of volume of geometric solids.
It is a well-known phenomenon that the sound of an approaching sound source is higher than that of a receding one.
The aircraft manufactured by the British de Haviland company was the world's first mass-produced commercial jetliner.
This animation presents the history of Ancient Rome throughout the centuries.
The legendary ruler and military leader, Alexander the Great, established a vast empire.
A presentation of the major administrative units of China.
Practise the English alphabet, build words from letters.
Practise the German alphabet and form words from the letters.
Practise the Russian alphabet, build words from letters.
Quetzalcoatlus was one of the largest known flying animals of all time.
Oil tankers appeared in the late 19th century; today they are among the largest ships.