Colourless, odourless gas, highly toxic to humans and animals in high concentration.
The Tower of Hanoi is a mathematical puzzle.
The Roman army, led by Flavius Aetius, stopped the Hun invasion led by king Attila
In the battle fought at the shores of Hellas, Octavian won a decisive victory over Marcus Antonius.
The emergency landing of the pilot appears in the frame story of Antoine de Saint-Exupéry´s most famous novel, The Little Prince.
The Rietveld Schröder House, located in the town of Utrecht in the Netherlands, can be considered a forerunner of modern houses.
Pharaoh Thutmose III defeated the rebellious coalition of Canaanite vassal states led by the king of Kadesh.
Because of the military conflict in Sudan, millions of people had to flee their homes.
A pilgrimage chapel designed by the French architect Le Corbusier, one of the greatest architects of the 20th century.
Villages were the first permanent human settlements
Three-dimensional assembly puzzle with solutions.
This animation demonstrates how microwave ovens work.
A type of settlement that has central functions.
The British Royal Fleet led by Admiral Lord Nelson defeated the combined Franco-Spanish fleet in the naval battle during the Napoleonic Wars.
Inhabitants of ancient Egypt wore characteristic clothes and jewellery.
During World War I France was part of the military alliance called ´Triple Entente´.
The battle ended with the victory of William the Conqueror´s Norman army over the English.
King Darius as well as Xerxes built pontoon bridges across the Bosphorus for the Persian army.
This animation presents the current refugee crisis from various points of view.
Dogs are the domesticated subspecies of grey wolves.