The Berlin Wall (1961-1989)

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

Medieval town

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

Elementary particles

Matter is made up by quarks and leptons, while interactions are carried by bosons.

Formula 1 racing car

Formula 1 is the highest class and most popular type of motor racing.

Diesel engine

The German engineer Rudolf Diesel patented the diesel engine in 1893.

Stonehenge (Great Britain, Bronze Age)

The world famous monument in England still poses mysteries for archeologist.

Ancient Roman domus

Wealthy citizens in ancient Rome owned large houses with varied layouts of several rooms.

Ancient Greek house

The average house in Ancient Greece had a rectangular, geometrical floor plan and two...

Mitosis

Mitosis is the process by which a eukaryotic cell divides into two cells and the number...

Optical illusion

The information gathered by the eye is misinterpreted by the brain.

Gutenberg's press (Mainz, 15th century)

Life magazine picked Gutenberg's invention of mechanical movable type printing as the...

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.

Geographic coordinate system

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

Change of seasons (intermediate)

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

The Sun

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

Structure of the Earth (intermediate)

The Earth is composed of several spherical layers.

The Solar System; planetary orbits

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

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