Viking chieftain (10th century)

Viking leaders were elected from tribe members by the right of blood or an act of bravery.

Edible frog

This animation demonstrates the anatomy of amphibians through the example of a common...

European honeybee

Honeybees produce a sweet and nutritious substance, honey.

Endocrine system

Glands of the endocrine system secrete hormones into the blood.

German alphabet game

Practise the German alphabet and form words from the letters.

Knee joint

The knee joint is made up by the femur, the tibia and the kneecap.

Administrative divisions of China

A presentation of the major administrative units of China.

Tooth brushing

Careful tooth brushing is an important part of oral hygiene.

Female reproductive system (intermediate)

The reproductive system is a series of organs working together for the purpose of...

Ukrainian Cossack (17th century)

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

Ratio of volumes of similar solids

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

English alphabet game

Practise the English alphabet, build words from letters.

Great Mosque of Djenné (1907)

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


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

American bison

The American bison is the largest land animal in North America.

Patellar reflex

The reflex triggered by the stretching of the thigh extensor muscle is the patellar reflex.


There are various types of instruments used for measuring temperature.

Rimac Concept One

Rimac Automobili's first model is known as the world's fastest production electric vehicle.

The upper gastrointestinal tract

During swallowing food travels from the mouth cavity into the stomach.


ATP is the main source of energy for cells.

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