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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.
It is a well-known phenomenon that the sound of an approaching sound source is higher than that of a receding one.
A presentation of the major administrative units of China.
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 Mongol ruler Genghis Khan established a huge empire through his conquests.
The legendary ruler and military leader, Alexander the Great, established a vast empire.
Practice the English alphabet, build words from letters.
Practice the German alphabet and form words from the letters.
Practice the Russian alphabet, build words from letters.
Quetzalcoatlus was one of the largest known flying animals of all time.
This 3D introduces a centipede species widespread in the Mediterranean.
Oil tankers appeared in the late 19th century; today they are among the largest ships.
Wind, as an external force, plays an important role in shaping coastal areas and steppes.
Let's learn about the bear species that became the symbol of species conservation.
Lasers are devices designed to emit narrow, monochromatic, high-intensity beams of light.
These special dolmens located in present-day Netherlands were built about 5,000 years ago.
Surface tension is the property of a liquid that allows it to obtain the smallest surface area possible.