Carbon cycle

Carbon is bound in organic substances during photosynthesis, while during breathing, it...

Continents and oceans

Dry land on the surface of Earth is divided into continents which are separated by oceans.

Taj Mahal (Agra, 17th century)

The centre of the Indian mausoleum complex is a white marble tomb built by Shah Jahan for...

Ancient Roman aqueduct and road

The excellent road and aqueduct system covering the whole empire reflects well the...

Pantheon (Rome, 2nd century)

The ´Temple of all gods´ was built during the reign of the Roman Emperor Hadrian.

Three-dimensional Cartesian coordinate system

3-dimensional Cartesian coordinate system with illustrations and exercises that develop...

Chess games

Chess games can help to develop logic skills.

Scale exercises

An interesting logical exercise: you have many weights that look the same, you have to...

How does it work? - Hair dryer

This animation demonstrates the structure and operation of hair dryers.

Electron configuration of calcium

This animation shows the electron configuration of the calcium atom.

Notable products

A spectacular demonstration of algebraic expressions.

Phase transitions

A phase transition is the change of a substance from one state of matter to another.

Structure of nitrogen molecules

This animation demonstrates the structure of nitrogen molecules, with one sigma and two...

The Dawn mission

Studying Ceres and Vesta will help us learn more about the early history of the Solar...

Mining at the time of the Industrial Revolution

At the end of the 18th century, mining boomed because of the great need for raw materials...

Geographical discoveries (15th-17th century)

Legendary geographical discoveries at the beginning of the Modern Age had not only...

The mechanism of vision

The curvature of the lens of the eye changes when we look at a distant or at a near...

Machu Picchu (15th century)

The ancient Inca city, located in present-day Peru, is a World Heritage Site.

Cloud formation, types of clouds

Evaporating surface water forms clouds of various shapes from which water falls back to...

Tenochtitlan (15th century)

The magnificent capital of the Aztec Empire astonished even the Spanish Conquistadors.

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