Notable products

A spectacular demonstration of algebraic expressions.

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 in the dynamically developing industry.

Structure of nitrogen molecules

This animation demonstrates the structure of nitrogen molecules, with one sigma and two pi bonds holding the atoms together.

Aluminium smelting

Aluminium smelting is the process of extracting aluminium from alumina by electrolysis.

Electron configuration of calcium

This animation shows the electron configuration of the calcium atom.

Structure of proteins

The structure and arrangement of polypeptide chains affects the spatial structure of proteins.

Phase transitions

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

The Dawn mission

Studying Ceres and Vesta will help us learn more about the early history of the Solar System and how rocky planets are formed.

Tenochtitlan (15th century)

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

Ancient Roman aqueduct and road

The excellent road and aqueduct system covering the whole empire reflects well the development of the Roman civilization.

Bedouin camp

The seminomadic lifestyle of the Bedouin adapted to the climatic and environmental conditions of the desert.

Cloud formation, types of clouds

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

Human muscles

Skeletal muscles form the active part of the locomotor system: they move the bones they are attached to.

Great Wall of China

A series of fortifications built to prevent incursions from northern nomadic groups

Macedonian siege tower (4th century BC)

The army of Alexander the Great successfully deployed siege towers in its attacks against fortifications.

Viking settlement (10th century)

Typical settlements of the Norsemen were not only established in Scandinavia, they appeared on distant areas as well.

Three-dimensional Cartesian coordinate system

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

Machu Picchu (15th century)

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

Mitosis

Mitosis is the process by which a eukaryotic cell divides into two cells and the number of chromosomes remains unchanged.

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