Phases of the Moon

During its orbit around the Earth, the visibility of the Moon's illuminated part...

Medieval farmhouse

Farmhouses in the Middle Ages were simple, single-storey structures built from earth, mud...

Auschwitz I Labour camp

The concentration camp established on Polish territory was the administrative centre of a...

Thermal power station (hydrocarbon fuel)

Thermal power stations convert energy released during the combustion of fossil fuels or...

Waterfalls

Waterfalls form where a river flows over a steep precipice in its course.

Thermal expansion of bridges

The length of the metal frameworks of bridges change when the temperature changes.

Transport networks

The animation presents the main air, water and land routes and transport hubs.

Male reproductive system

The reproductive system consists of organs which work together for the purpose of...

Limbic system

The limbic system plays an important role in forming emotions and in learning.

Constructing shapes (3D)

Building 3D shapes into a given cube mesh with the help of several views.

Geothermal power station

Geothermal power stations convert energy of hot, high-pressure water found in deeper...

Safety equipment of bicycles

The highway code contains rules concerning the safety equipment of bicycles.

Evolution of the bicycle

The changing bicycle, at first mocked as a toy, is a true mirror of the technical...

Farming techniques

Farming techniques evolved with the development of human civilisation in the Middle Ages...

Gametes

The zygote is the initial cell formed when two gamete cells are joined by means of sexual...

Gothic cathedral (Clermont-Ferrand, 15th century)

The cathedral named after the Assumption of Mary into Heaven is one of the gems of French...

Cannon operation (18th century)

The cannon was an important type of firearms at the beginning of modern history,...

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