Sphere

A sphere is the set of points which are all within the same distance from a given point in space.

Satellite types

Satellites orbiting the Earth can be used for civilian or military purposes.

Mercury

Mercury is innermost and smallest planet of the Solar System.

SM U-35 submarine (Germany, 1912)

Submarines had an important role in naval warfare as early as World War I.

Palace of Charlemagne (Aachen 9th century)

The palace of Charlemagne was not only the centre of his empire, but also a centre of culture.

Cylindrical solids

This animation demonstrates various types of cylindrical solids as well as their lateral surfaces.

Metropolises

A metropolis is a large city with a population of over 1 million people.

Mars

Possible traces of water and life are sought on Mars.

Jupiter

Jupiter is the largest planet of the Solar System, it has two and a half times the mass of all the other planets combined.

Cube of cubes

An exercise about the regular hexahedron built from unit cubes to help deepen your knowledge of cubes.

Solar power station

Solar power stations convert solar energy into electricity.

Nitric acid (HNO₃)

One of the oxoacids of nitrogen. A colourless compound with a pungent odour, a strong oxidant.

Robots

An entertaining game about different views of spatial objects.

House without carbon-dioxide emission

The design and structure of modern houses play an important role in environmental protection.

Glacier (intermediate)

A glacier is a large body of ice that forms from snow, and is in constant, slow motion.

Tanning, skin cancer

The topmost layer of our skin is the epidermis, which contains melanocytes.

Time zones

The Earth is divided into 24 time zones. Standard time is the time used within time zones.

The Knights Templar (12th-13th century)

One of the most important religious military orders, formed in the era of the Crusades.

The city of Ur (3rd millennium BC)

The ancient city located near the river Euphrates was an important Sumerian centre.

Land reclamation in the Netherlands, 17th century

Inhabitants of the northern part of the Netherlands have successfully fought the sea since the Middle Ages.

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