Colour vision deficiency

The inability to differentiate certain shades of colour is called colour vision deficiency.

The Madara rider

A rock relief located in Northeast Bulgaria, probably carved at the end of the 7th century.

Polynesian family settlement (Samoa, 15th century)

The architecture of traditional Samoan family settlements reflect the unique culture of their inhabitants.

Slavs

Modern Slavs live in 14 European countries that can be classified into 3 groups.

Oil tanker

Oil tankers appeared in the late 19th century; today they are among the largest ships.

Northern white-breasted hedgehog

The Northern white-breasted hedgehog rolls into a ball to protect itself.

The structure of prokaryotic and eukaryotic cells

There are two basic cell types: prokaryotic and eukaryotic cells.

Great Mosque of Djenné (1907)

The mosque, built in a distinctive architectural style, is the largest adobe structure in the world.

Ratio of volumes of similar solids

This 3D scene explains the correlation between the ratio of similarity and the ratio of volume of geometric solids.

Ukrainian Cossack (17th century)

Cossacks, members of independent semi-military communities, played an important role in the history of Ukraine.

Administrative divisions of China

A presentation of the major administrative units of China.

German alphabet game

Practise the German alphabet and form words from the letters.

English alphabet game

Practise the English alphabet, build words from letters.

Russian alphabet game

Practise the Russian alphabet, build words from letters.

The adrenal glands

The adrenal glands are responsible for maintaining homeostasis and producing a rapid response in stressful situations.

Thermometers

There are various types of instruments used for measuring temperature.

Bone structure

This scene explains the structure and functions of the bones.

How does it work? - PET-CT

By positron emission tomography (PET), we can obtain visual information on our internal organs without making any surgical incisions.

Unmanned aerial vehicles (UAV)

The range of applications of unmanned aerial vehicles ('drones') keeps growing.

How does it work? - Vacuum cleaner

The vacuum cleaner creates a partial vacuum and sucks up dust with the help of the incoming high-pressure air.

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