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The products of oil refining include diesel oil, petrol and lubricants.
Napoleon Bonaparte´s Grande Armée was considered invincible.
The Channel Tunnel is a 50.5 km long railway tunnel between the United Kingdom and France, beneath the English Channel.
The design and structure of modern houses play an important role in environmental protection.
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.
Raw iron is produced from iron ore in iron smelters.
The treated wastewater can be used for agricultural and industrial purposes.
As opposed to underground mines, in open-pit mines the layers covering coal are removed, so the coal can be extracted on the surface.
Tidal power stations utilise the daily fluctuation of the water level to produce electricity.
The outcome of one of the greatest battles in the history of the ancient East (fought by the Egyptians and Hittites) was indecisive.
The term 'hussar' refers to a type of light cavalry which originated in Hungary and was the most popular in the 18th–19th centuries.
The fearsome looking Aztec warriors could not stop the Spanish conquistadors with their primitive weapons.
Spanish conquerors owed their success to their armour and firearms.
English sailing ships were among the best ships in the 17th-19th centuries.
Keeps were typical buildings in the Middle Ages, also built independently from castles.
The Möbius strip and the Klein bottle are special two-dimensional surfaces with only one side.
Edges, diagonals and faces of a cube can be identified by its vertices.
A fuel cell provides environment-friendly electric energy produced by the chemical reaction between oxygen and hydrogen.
This animation demonstrates the five regular three-dimensional (or Platonic) solids, the best known of which is the cube.
The staggered conformation of ethane is more stable than the eclipsed conformation.
More than one million people died in the WWII Nazi death camp located in present-day Poland.
The Greek fleet owed their success to their good tactics and their fast and easily manoeuvrable ships.
One of the greatest archaeological finds of the 20th century was the tomb of the Egyptian pharaoh.