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Combine harvesters are machines that harvest and thresh grain crops.
This animation demonstrates the structure and operation of impulse turbines.
Dogs are the domesticated subspecies of grey wolves.
The Global Positioning System consists of 24 satellites but only 4 have to be visible for...
Typical flats characterise the culture of the decade.
Three-dimensional assembly puzzle with solutions.
The Soviet-made twin-engine interceptor aircraft was first deployed in 1982.
The Fighting Falcon is the most successful aircraft in the category of multi-purpose...
Alkanes are saturated hydrocarbons which can be organised into a homologous series.
The animation shows the forms of government and official languages of the world´s countries.
The surface of a sphere consists of the set of points which are all at the same distance...
Simple harmonic motion can be considered to be the one-dimensional projection of uniform...
During World War I, Britain was part of the military alliance called the ´Triple Entente´.
The B-2 Spirit heavy stealth bomber was deployed in the Balkan war, Afghanistan and Iraq.
The British Royal Fleet led by Admiral Lord Nelson defeated the combined Franco-Spanish...
During World War I France was part of the military alliance called ´Triple Entente´.
German sordiers in the First World War were well trained and used modern weapons.
Television, invented in the early 20th century, became one of the basic forms of...
The Ottoman fleet suffered a catastrophic defeat by the fleet of the Holy League.
The battle ended with the victory of William the Conqueror´s Norman army over the English.