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The head of the Byzantine Empire, the direct continuation of the Roman Empire, was the emperor.
The Aztec Empire was a despotic, militaristic state ruled by the tlatoani.
The most important weapons of medieval Arab warriors were the bow and the sword.
The Incas´ rudimentary weapons were inadequate in their struggle against the Spanish Conquistadors.
The masterpieces of ancient Greek potters are important archaeological artefacts.
An ancient Greek myth about the tragedy of father and son who wanted to flee the island of Crete.
A long pipe in the centre of the tower penetrates the ocean bed until it reaches the layer that contains oil.
The withdrawal reflex is a spinal reflex that ensures moving away from potentially damaging stimuli.
Public schools in villages played an important role in education.
The building complex was one of the most important Benedictine abbeys for centuries.
A type of herbivorous dinosaur easily recognisable by its large frill and three horns which lived in the Cretaceous period.
The Ottoman army included janissaries (paid warriors) and sipahis (vassal knights).
This animation demonstrates how a refrigerator works.
The French monarch got his epithet because of his opulent and extravagant lifestyle.
Cinemas were built in large numbers in big cities of the US in the 1910s.
Located in the Grand Mosque of Makkah, the Kaaba shrine is the most sacred site of Islam.
These tools, revolutionary even in their simplicity, are still in use today.
A type of prehistoric reptile having bony plates on its back, which aided thermoregulation.
The dentition of different species of mammals reflect their feeding habits.
A liquid-crystal display utilises the light modulating properties of liquid crystals.
The ancient city located near the river Euphrates was an important Sumerian centre.
The name of the Russian armoured cruiser became well known during the October Revolution of 1917.