Structure of the Earth (intermediate)

The Earth is composed of several spherical layers.

Lymphatic system

Lymph vessels carry lymph to the blood vessels, while lymph nodes are integral parts of...

The Solar System; planetary orbits

The orbits of the 8 planets in our Solar System are elliptical.

Change of seasons (intermediate)

Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes...

Geographic coordinate system

The geographic coordinate system enables every location on the Earth to be exactly specified.

Atmospheric circulation

The difference between the temperature of the polar and equatorial zones causes...

ISS

The International Space Station is a habitable satellite built with the cooperation of 16...

The human eye

The eye is one of our most important sense organs. When stimulated by light, electric...

Glands connected to the duodenum

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

Pantheon (Rome, 2nd century)

The ´Temple of all gods´ was built during the reign of the Roman Emperor Hadrian.

Common bottlenose dolphin

Bottlenose dolphins are sea mammals which use ultrasound for orientation.

Chest

The ribcage, the sternum and the spinal column together form the chest, in which the...

Bacteria (spheres, rods, spirals)

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

Namdaemun (Seoul, South Korea, 14th c.)

Designated as the first National Treasure of South Korea, the Namdaemun was one of the...

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

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

Dynamo (intermediate)

A dynamo converts mechanical energy into direct current.

Appendicitis

The inflammation of the vermiform appendix, which is connected to the cecum, requires...

Samurai

The primary duty of these Japanese warriors was to serve their feudal lords, even at the...

Himeji Castle

Located close to Osaka, the Japanese castle is also called the White Heron because of its...

Knossos Palace (2nd millenium BC)

The largest bronze-age building complex of ancient Crete was probably the centre of...

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