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

Designated as the first National Treasure of South Korea, the Namdaemun was one of the major gateways of Seoul's Medieval city walls.

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

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

The human eye

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

ISS

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

Stonehenge (Great Britain, Bronze Age)

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

How does it work? - Gearbox

In transmission systems, the engine torque is modified by reducing or increasing rotational speed.

Earth

The Earth is a rocky planet with a solid crust and oxygen in its atmosphere.

Medieval town

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

Ancient Greek house

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

Ancient Roman domus

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

Viruses

Viruses consist of protein and DNA or RNA, they reprogram infected cells to produce more viruses.

Parts of the human body

This animation demonstrates the parts of the head, the torso and the limbs.

Santa Maria (15th century)

Christopher Columbus' three-masted carrack, the Santa Maria was the flagship of his first, landmark voyage.

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.

Offshore natural gas extraction, Norway

The Troll A is an offshore natural gas platform, the largest offshore platform ever built: it rises about 170 meters (558 feet) above water level, weighs...

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 continuously changes during the year.

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 atmospheric circulation which is affected by a number of factors, including...

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