Aztec ruler (15th century)

The Aztec Empire was a despotic, militaristic state ruled by the tlatoani.

Generating alternating current

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

Byzantine Emperor (6th century)

The Byzantine Emperor was the head of the Byzantine Empire, the direct continuation of the Roman Empire.

Arab warrior (6th century)

The most important weapons of medieval Arab warriors were the bow and the sword.

Inca warrior (15th century)

The Incas´ rudimentary weapons were inadequate in their struggle against the Spanish Conquistadors.

Homo erectus

The ‘upright man’ used tools and could set fire.

Hierarchy of the Medieval Christian church (11th century)

This animation shows the hierarchical structure of the Medieval Christian church.

Radioactivity

The process of the decay of unstable nuclei is called radioactivity.

Niche

In ecology, a niche is a term describing the way of life of a species.

String quartet

A string quartet consists of four string players, it appeared in the late 18th century.

Piano

The piano is one of the most popular instruments in the world. It is a chordophone which produces sounds mechanically.

Relief map of China

An introduction to the relief and hydrography of China.

How does it work? - Differential gear

A differential allows the driven wheels of a car to rotate at different speeds when the car is turning.

Forces

The animation shows the way forces act on wheeled vehicles and vehicles with runners.

The phosphorus cycle

The phosphorus cycle describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.

Viking chieftain (10th century)

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

Red deer

Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.

Common earthworm

The anatomy of annelids is demonstrated through the example of the common earthworm.

Heart attack

The cause of a heart attack is the blockage of a coronary artery. It is one the most common causes of death.

Louis XIV (the Sun King)

The French monarch got his epithet because of his opulent and extravagant lifestyle.

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