This animation demonstrates the structure of nitrogen molecules, with one sigma and two pi bonds holding the atoms together.
The first commercially successful technique of photography was invented by the French Louis Daguerre.
A phase transition is the change of a substance from one state of matter to another.
Evaporating surface water forms clouds of various shapes from which water falls back to the surface as precipitation.
This animation shows the electron configuration of the calcium atom.
The ancient Inca city, located in present-day Peru, is a World Heritage Site.
An average Egyptian dwelling consisted of regularly arranged rooms.
The Parisian prison became legendary after the Revolution of 1789.
The Giza Necropolis is the only one of the Ancient wonders still intact.
Neurons transmit electrical signals via chemical and electrical synapses.
These great scientists had a tremendous impact on the advancement in physics.
Napoleon I, who crowned himself emperor, was one of the most outstanding military commanders in history.
These organs are vital for the survival and development of plants.
The liver is a vital organ that plays an important role in the digestion of fats, detoxification and metabolism.
The Code of Hammurabi is the emblem of the Mesopotamian civilisation; it contains 282 laws carved into a basalt stele.
Galileo Galilei's scientific achievements contributed greatly to the advancement of physics and astronomy.
This animation demonstrates the fine molecular structure and mechanism of muscles.
Cereals are species of grasses cultivated for their edible grains.
The intriguing history of this historic castle spans nearly a thousand years.
In mountainous areas the climate, soil properties, the flora and fauna change depending on elevation.