This animation demonstrates instruments used to examine atmospheric phenomena.
Treated sewage water can be used in agriculture and industry.
The marathon running event was instituted in commemoration of the run of a Greek soldier after the Battle of Marathon, fought between the Athenian and the...
Satellites orbiting the Earth can be used for civilian or military purposes.
One of the greatest archaeological finds of the 20th century was the tomb of the Egyptian pharaoh.
The Earth is divided into 24 time zones. Standard time is the time used within time zones.
Tidal power stations utilise the daily fluctuation of the water level for producing electricity.
The animation offers a summary of the history of aviation from the Middle Ages.
As opposed to underground mines, in open-pit mines the layers covering coal are removed, coal is extracted on the surface.
The submarine designed by the Spanish inventor Narcís Monturiol was a pioneering work in the history of underwater navigation.
The Greek fleet owed their success to their good tactics and their fast and easily manoeuvrable ships.
The colonising powers´ colours were wiped off the map by the nations fighting to regain their independence.
More than one million people died in the WWII Nazi death camp located in present-day Poland.
A fuel cell provides environment-friendly electric energy produced by the chemical reaction between oxygen and hydrogen.
Raw iron is produced from iron ore in iron smelters.
Concave and convex lenses are used for the correction of short-sightedness and far-sightedness.
Electrochemical processes in a lead-acid battery produce electric current.
This animation demonstrates birds' bones and eggs through the example of the common blackbird.
A variety of peripherals can be used with laptop computers.
This animation demonstrates the construction of a fire engine.