The Gaul city Alesia, defended by Vercingetorix, was besieged by the Roman forces of Julius Caesar in 52 BC.
Plants are capable of converting inorganic substances (carbon dioxide and water) into organic sugar.
This animation demonstrates several types of prisms, from general to regular.
One of the best known species of spiders, often kept as pets. Its bite is not fatal for humans.
The B-2 Spirit heavy stealth bomber was deployed in the Balkan war, Afghanistan and Iraq.
The British Royal Fleet led by Admiral Lord Nelson defeated the combined Franco-Spanish fleet in the naval battle during the Napoleonic Wars.
The Votive Church of Szeged, located on the Great Plains of Hungary, emerges from the buildings of the city's famous square, while the National Pantheon can...
The Fighting Falcon is the most successful aircraft in the category of multi-purpose fighters.
The battle ended with the victory of William the Conqueror´s Norman army over the English.
The Ottoman fleet suffered a catastrophic defeat by the fleet of the Holy League.
The Soviet-made twin-engine interceptor aircraft was first deployed in 1982.
During World War I France was part of the military alliance called ´Triple Entente´.
Typical flats characterise the culture of the decade.
This animation demonstrates the construction of motorcycles.
World War I brought major changes in military technology, due to the development of new weapons.
Alkanes are saturated hydrocarbons which can be organised into a homologous series.
The animation shows the forms of government and official languages of the world´s countries.
Three-dimensional assembly puzzle with solutions.
Cyclones are large areas of swirling air with clouds and precipitation being formed inside.
Dogs are the domesticated subspecies of grey wolves.