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As the Roman Empire expanded, military camps were established on the newly conquered territories.
The city with advanced culture was the first settlement in history to have a citadel.
The Olympic Games, held in the town every 4th year after 776 BC made it one of the centres of ancient Greece.
Farming techniques evolved with the development of human civilisation in the Middle Ages and the Modern Age.
The cannon was an important type of firearms at the beginning of modern history, widespread both on land and water.
These excellent shipbuilders and sailors travelled great distances on the seas and rivers.
Learn about types of towers and bastions typical of medieval Europe.
Jamestown, founded in 1607, was the first permanent English settlement on the east coast of North America.
Building 3D shapes into a given cube mesh with the help of several views.
Hydrogen atoms within hydrogen molecules are held together by a covalent bond.
Soap is a detergent consisting of sodium or potassium salts of long-chain fatty acid molecules, suitable for removing fat stains.
Satellites orbiting the Earth can be used for civilian or military purposes.
This animation demonstrates instruments used to examine atmospheric phenomena.
During the substitution reaction the hydrogen atoms of methane are substituted with chlorine atoms, the by-product is hydrogen chloride.
The Earth is divided into 24 time zones. Standard time is the time used within time zones.
The Earth is divided into geographical and climatic zones, which result in the zonation of vegetation.
The dreaded warriors of the Mongol Empire made it one of the largest empires in history.
Napoleon Bonaparte´s Grande Armée was considered invincible.
A glacier is a large body of ice that forms from snow, and is in constant, slow motion.
Atmospherical nitrogen is bound by bacteria and used by living organisms in the form of various compounds.
Solar power stations convert solar energy into electricity.
The purpose of the electricity supply network is to provide electricity for users.