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The magnificent capital of the Aztec Empire astonished even the Spanish Conquistadors.
A phase transition is the transformation of a substance from one state of matter to another.
This animation demonstrates the structure of nitrogen molecules, with one sigma and two pi bonds holding the atoms together.
Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes continuously changes during the year.
At the end of the 18th century, mining boomed because of the great need for raw materials in the dynamically developing industry.
Legendary geographical discoveries at the beginning of the Modern Age had not only redrawn maps, but also had a truly diverse impact.
This animation presents the main types of leaves and the differences between monocot and dicot leaves.
This animation explains transparency and opacity, the principle of radiography, and the light-absorbing properties of materials.
Typical settlements of the Norsemen were not only established in Scandinavia, they appeared on distant areas as well.
These Paleolithic statuettes probably symbolize fertility and prosperity.
The army of Alexander the Great successfully deployed siege towers in its attacks against fortifications.
A series of fortifications built to prevent incursions from northern nomadic groups.
The excellent road and aqueduct system covering the whole empire reflects well the development of the Roman civilization.
The Benz Patent-Motorwagen is widely regarded as the first vehicle propelled by an internal combustion engine.
The seminomadic lifestyle of the Bedouin adapted to the climatic and environmental conditions of the desert.
This Pacific island is famous for its unique monolithic human figures.
Skeletal muscles form the active part of the locomotor system: they move the bones they are attached to.
The large intestine is the last section of our digestive track.
This animation shows the electron configuration of the calcium atom.
The geographic coordinate system enables every location on the Earth to be exactly specified.