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Great Wall of China

A series of fortifications built to prevent incursions from northern nomadic groups.

Syrian water wheels (City of Hama, 13th century)

Medieval Syrian water wheels were used to convey water to distant areas.

Ancient Roman aqueduct and road

The excellent road and aqueduct system covering the whole empire reflects well the development of the Roman civilization.

Macedonian siege tower (4th century BC)

The army of Alexander the Great successfully deployed siege towers in its attacks against fortifications.

Marie Curie's laboratory

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 (spheres, rods, spirals)

Bacteria occur in a wide range of shapes, including spheres, rods and spirals.

Atmospheric circulation

The difference between the temperature of the polar and equatorial zones causes atmospheric circulation which is affected by a number of factors, including...

Glands connected to the duodenum

The pancreas and the liver empty digestive juices into the duodenum.

Gutenberg's press (Mainz, 15th century)

Life magazine picked Gutenberg's invention of mechanical movable type printing as the most important event of the second millennium.

The Berlin Wall (1961–1989)

A symbol of division and oppression, the Wall tore a city and numerous families apart.

Moai (Easter Island, 16th century)

This Pacific island is famous for its unique monolithic human figures.

Medieval town

Medieval townhouses were built from stone or brick and were several stories high.

B-24 Liberator

The B-24 Liberator was an American heavy bomber aircraft, built in large numbers, that was used on every front during World War II.

Scale exercises

An interesting logical exercise: you have many weights that look the same, you have to find the only one that is different.

Appendicitis

The inflammation of the vermiform appendix, which is connected to the cecum, requires immediate surgical intervention. The animation shows the cause and...

Terms of physical geography

This animation demonstrates the most important relief features, surface waters and their relevant symbols.

Bedouin camp

The seminomadic lifestyle of the Bedouin adapted to the climatic and environmental conditions of the desert.

The human eye

The eye is one of our most important sense organs. When stimulated by light, electric impulses are produced by its receptors.

The Sun

The diameter of the Sun is about 109 times that of the Earth. Most of its mass consists of hydrogen.

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