Phases of the Moon

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

Palace of Charlemagne (Aachen 9th century)

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

Bones of the lower limbs

Bones of the lower limbs are connected to the trunk by the pelvis.

Fuel cell

A fuel cell provides environment-friendly electric energy produced by the chemical reaction between oxygen and hydrogen.

Shale gas

This animation explains the technology of shale gas extraction.

Medical conditions of the spine

Scoliosis is a medical condition in which a person's spine has a lateral deviation.

Auschwitz I Labour camp

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

Generating alternating current

Electric current can be generated by rotating an armature loop in a magnetic field.

Medieval keep

Keeps were typical buildings in the Middle Ages, also built independently from castles.

Otto Lilienthal’s glider

The German engineer Otto Lilienthal was the first person to make successful flights with a glider designed by himself.

Thermal power station (hydrocarbon fuel)

Thermal power stations convert energy released during the combustion of fossil fuels or renewable resources into electricity.

Platonic solids

This animation demonstrates the five regular three-dimensional (or Platonic) solids, the best known of which is the cube.

The urinary system

The urinary system serves for the removal of harmful and useless materials from the body.

Diversity of light-detecting organs

Several analogous types of eyes have developed independently through convergent evolution.

Measuring time

The first calendars and time-measuring instruments were already used by ancient Eastern civilisations.

Operation of oil wells

Machinery that pumps crude oil to the surface

Cellulose (C₆H₁₀O₅)n

The building material of the cell walls and fibres of plants.

Venus

Venus is the 2nd planet from the Sun, the brightest object on the night sky (after the Moon).

The first days in school

Learn the concept of colours, numbers, letters and shapes while playing

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