This animation demonstrates how an escalator works.
The name of the Russian armoured cruiser became well known during the October Revolution of 1917.
The fearsome looking Aztec warriors could not stop the Spanish conquistadors with their primitive weapons.
The outcome of one of the greatest battles in the history of the ancient East (fought by the Egyptians and Hittites) was indecisive.
Wind power stations convert the kinetic energy of the wind into electricity.
Nuclear propulsion was first used by the US Navy for powering submarines in the mid-20th century.
One of the most important religious military orders, formed in the era of the Crusades.
Robert Fulton American engineer created the first operational steam-powered ship.
The ancient city located near the river Euphrates was an important Sumerian centre.
Inhabitants of the northern part of the Netherlands have successfully fought the sea since the Middle Ages.
Producing speech requires the synchronised operation of several cortical centres.
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.
The German triplane was perhaps the best known plane in World War I.
The ancestors of Arachnida and Crustacea belonged to the class Trilobita.
Long-necked herbivorous dinosaur with a robust body.
An air conditioner cools the air inside by drawing heat away and releasing it outside.
Spanish conquerors owed their success to their armour and firearms.
Burj Al Arab, the world's only seven-star luxury hotel is located in the United Arab Emirates.
Tanks developed in the mid-1910s quickly became the most important weapons of land-based military operations.