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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.
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 Rosetta Stone helped to solve the mystery of hieroglyphics.
Eurypterids are an extinct group of Palaeozoic aquatic arthropods.
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.
The aircraft manufactured by the British de Haviland company was the world's first mass-produced commercial jetliner.
The animation presents the largest mountains, plains, rivers, lakes and deserts of the Earth.
This animation presents the history of Ancient Rome throughout the centuries.
The legendary ruler and military leader, Alexander the Great, established a vast empire.
The Pula Arena, located in present-day Croatia, was one of the largest Roman amphitheatres in the Antiquity.
This stunning castle is situated in northern Croatia.
Modern Slavs live in 14 European countries that can be classified into 3 groups.
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.
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.
An introduction to the relief and hydrography of China.
Oil tankers appeared in the late 19th century; today they are among the largest ships.