The Chengdu J-20, also known as Mighty Dragon, is a multiple function stealth fighter aircraft.
The colonising powers´ colours were wiped off the map by the nations fighting to regain their independence.
A sphere is the set of points which are all within the same distance from a given point in space.
Robert Fulton American engineer created the first operational steam-powered ship.
The Earth is divided into 24 time zones. Standard time is the time used within time zones.
Tidal power stations utilise the daily fluctuation of the water level for producing electricity.
As opposed to underground mines, in open-pit mines the layers covering coal are removed, coal is extracted on the surface.
An entertaining animation to practise orientation using a map.
The first indoor theatre in modern history to be constructed according to the theatre-building codes of Antiquity was inaugurated in 1585.
Treated sewage water can be used in agriculture and industry.
Raw iron is produced from iron ore in iron smelters.
The Voyager space probes were the first man-made objects to leave the Solar System. They gather data about outer space and carry information about humanity.
The design and structure of modern houses play an important role in environmental protection.
The Channel Tunnel is a 50.5 km long railway tunnel between the United Kingdom and France, beneath the English Channel.
The products of oil refining include diesel oil, petrol and lubricants.
Schooners, first built in the Netherlands in the 17th century, were mainly used as merchant ships.
From the 1940s, the increasingly large aircraft carriers became the masters of the oceans.
A bireme is a type of ancient warship, with a characteristic pointed bow and two decks of oars, used by many armies.
The fat-tailed scorpion is one of the world's most dangerous scorpions.
The topmost layer of our skin is the epidermis, which contains melanocytes.