A spectacular demonstration of algebraic expressions.
At the end of the 18th century, mining boomed because of the great need for raw materials in the dynamically developing industry.
This animation demonstrates the structure of nitrogen molecules, with one sigma and two pi bonds holding the atoms together.
Aluminium smelting is the process of extracting aluminium from alumina by electrolysis.
This animation shows the electron configuration of the calcium atom.
The structure and arrangement of polypeptide chains affects the spatial structure of proteins.
A phase transition is the transformation of a substance from one state of matter to another.
Studying Ceres and Vesta will help us learn more about the early history of the Solar System and how rocky planets are formed.
The magnificent capital of the Aztec Empire astonished even the Spanish Conquistadors.
The excellent road and aqueduct system covering the whole empire reflects well the development of the Roman civilization.
The seminomadic lifestyle of the Bedouin adapted to the climatic and environmental conditions of the desert.
Evaporating surface water forms clouds of various shapes from which water falls back to the surface as precipitation.
Skeletal muscles form the active part of the locomotor system: they move the bones they are attached to.
A series of fortifications built to prevent incursions from northern nomadic groups
The army of Alexander the Great successfully deployed siege towers in its attacks against fortifications.
Typical settlements of the Norsemen were not only established in Scandinavia, they appeared on distant areas as well.
3-dimensional Cartesian coordinate system with illustrations and exercises that develop spatial perception.
The ancient Inca city, located in present-day Peru, is a World Heritage Site.
Cannons also appeared in naval warfare.
Mitosis is the process by which a eukaryotic cell divides into two cells and the number of chromosomes remains unchanged.