The Zuiderzee Works and the Delta Works (Netherlands)

Remarkable civil engineering works to continue the Netherland's centuries-long fight...

Glaciation

The last Ice Age ended about 13 thousand years ago.

Typical dwelling types

Every era and every culture has specific residential buildings.

Jameh Mosque (Isfahan, 15th century)

Its architectural solutions and ornamentation rank this mosque among the masterpieces of...

Turkish bath (16th century)

One of the positive influences of the Ottoman invasion of Europe was the construction of...

Bone structure

This scene explains the structure and functions of the bones.

The adrenal glands

The adrenal glands are responsible for maintaining homeostasis and producing a rapid...

Fjord

A fjord is a long, narrow inlet with steep sides, created in a valley carved by glacial...

The structure of prokaryotic and eukaryotic cells

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

NAD⁺, NADP⁺, NADPH

NAD⁺ is a coenzyme that plays an important role mainly in catabolic processes, while NADP...

Geyser

A geyser is a spring characterised by intermittent discharge of water and steam.

The history of human migration

The migration of large human populations began in Ancient times.

Milky Way

The diameter of our galaxy is about 100,000 light years; it contains more than 100...

Water supply system

The water supply system provides clean and safe drinking water for the consumers.

Traditional Eskimo lifestyle

Igloos were the typical dwellings built by Eskimos living in the Arctic zone.

Russian alphabet game

Practise the Russian alphabet, build words from letters.

Types of synovial joints

Synovial joints can be categorised by the direction of movement they allow.

Male reproductive system

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

Hussite wagon fort

The Hussites mastered the use of war wagons in the 15th century.

Battle of Issus (333 BC)

The battle ended with the overwhelming victory of the Macedonian army over the Persian...

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