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A series of fortifications built to prevent incursions from northern nomadic groups.
Medieval Syrian water wheels were used to convey water to distant areas.
The excellent road and aqueduct system covering the whole empire reflects well the development of the Roman civilization.
The army of Alexander the Great successfully deployed siege towers in its attacks against fortifications.
Marie Curie, the only person to win the Nobel Prize in two different sciences, is probably the most famous woman in the history of science.
Bacteria occur in a wide range of shapes, including spheres, rods and spirals.
Eukaryotic cells contain a number of organelles.
The difference between the temperature of the polar and equatorial zones causes atmospheric circulation which is affected by a number of factors, including...
The pancreas and the liver empty digestive juices into the duodenum.
Life magazine picked Gutenberg's invention of mechanical movable type printing as the most important event of the second millennium.
A symbol of division and oppression, the Wall tore a city and numerous families apart.
This Pacific island is famous for its unique monolithic human figures.
Medieval townhouses were built from stone or brick and were several stories high.
The B-24 Liberator was an American heavy bomber aircraft, built in large numbers, that was used on every front during World War II.
An interesting logical exercise: you have many weights that look the same, you have to find the only one that is different.
The inflammation of the vermiform appendix, which is connected to the cecum, requires immediate surgical intervention. The animation shows the cause and...
This animation demonstrates the most important relief features, surface waters and their relevant symbols.
The seminomadic lifestyle of the Bedouin adapted to the climatic and environmental conditions of the desert.
The eye is one of our most important sense organs. When stimulated by light, electric impulses are produced by its receptors.
The diameter of the Sun is about 109 times that of the Earth. Most of its mass consists of hydrogen.