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A medieval glider constructed by Abbas Ibn Firnas.
Viruses consist of protein and DNA or RNA; they reprogram infected cells to produce more viruses.
A force can be measured by measuring the twisting of the torsion wire in a torsion balance.
The saker falcon is a large bird of prey widespread in Europe and and Asia.
The Rietveld Schröder House, located in the town of Utrecht in the Netherlands, can be considered a forerunner of modern houses.
The Jumbo Jet is one of the best known airliners.
Burj Al Arab, the world's only seven-star luxury hotel is located in the United Arab Emirates.
Groups of western jackdaws are frequently found in cities. Konrad Lorenz analysed the complex social behaviour of these animals.
Change of light conditions in different seasons. Measuring height using shadows.
Villages were the first permanent human settlements
Crystalline allotrope of elemental carbon, the hardest known natural substance.
The medieval Arab inventor, Hassan Al Rammah designed the world's first operating torpedo.
One of the crystalline allotropes of elemental carbon.
The mummified body of a man who probably lived in the Chalcolithic period, was found in one of the glaciers of the Alps.
A floatplane (sometimes called hydroplane) is an aircraft capable of taking off not only dry land, but water too.
The iron lattice tower, erected for the 1889 World Fair, became the symbol of the capital city of France.
A Romanesque style Benedictine church with a special gateway, built in the 13th century in Hungary.
The most popular European-made transport aircraft before World War II.
A Zeppelin is a type of controllable, rigid airship.
This animation presents animals commonly kept as livestock and the primal cuts of their meat.