Administrative divisions of China

A presentation of the major administrative units of China.

Electric bell

Mechanical bell that functions by means of an electromagnet.

Voice production

When producing sound, the vocal cords are vibrated by the air flowing out of the lung.

Anatomy of the small intestine

The longest part of the digestive system, where most of the digestion and absorption...

African village (Sudan)

African villages adapt to the natural environment well and reflect of the culture of...

Multilingual alphabet game

Practice the alphabet and form words from the letters.

Nervous system

The central nervous system consists of the brain and the spinal cord, the peripheral...

The heart

The heart is the central pump of the cardiovascular system beating several billion times...

Yuri Gagarin’s journey to outer space (1961)

Yuri Gagarin became the first human in space on April 12, 1961.

Layers of the skin; cutaneous senses

The skin is the soft outer covering of our body, its three layers are the epidermis, the...

Nuclear power plant

Nuclear power plants convert the energy released during nuclear fission into electric power.

Terms of physical geography

This animation demonstrates the most important relief features, surface waters and their...

Covalent bonds in benzene molecules

In benzene there are sigma bonds and delocalized pi bonds between carbon atoms.

Baths of Caracalla (Rome, 3rd century)

The magnificent bath complex of the Roman Emperor was built in the 3rd century A.D.

Gutenberg's press (Mainz, 15th century)

Life magazine picked Gutenberg's invention of mechanical movable type printing as the...

Watt´s steam engine (18th century)

The steam engine, perfected by the Scottish engineer James Watt, revolutionized technology.

Medieval town

Medieval townhouses were built from stone or brick and were several stories high.

Hot-air balloon (18th century)

The French Montgolfier brothers were the first pioneers of flying.

Chain reaction

Energy released during nuclear fission can be used for civilian or military purposes.

Human skeleton

Our body´s internal support structure to which skeletal muscles are attached.

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