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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.
Spanish conquerors owed their success to their armour and firearms.
Dicotyledons have two embryonic leaves (cotyledons), while monototyledons have only one.
Uranus is the 7th planet from the Sun, a gas giant.
English sailing ships were among the best ships in the 17th-19th centuries.
This animation demonstrates the structure of water towers.
Slavic warriors were greatly respected throughout Europe in the Middle Ages.
One of the most beautiful Art Nouveau buildings in Hungary.
A compound ion produced from carbonic acid by releasing protons.