Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.
This animation demonstrates how lifts work.
A transitional form between fish and tetrapods, or four-limbed vertebrates.
The Global Positioning System consists of 24 satellites but only 4 have to be visible for positioning.
This animation demonstrates how sonar works.
Three-dimensional assembly puzzle with solutions.
Several European countries joined the conquest of the New World, making America a colourful continent.
Due to its design and location, the Opera House of the Australian city is one of the most extraordinary opera houses in the world.
A colourful and entertaining animation to practise orientation in space.
The Roman army, led by Flavius Aetius, stopped the Hun invasion led by king Attila
A beehive tomb on the site of the ancient city of Mycenae, attributed to the legendary king.
The Gaul city Alesia, defended by Vercingetorix, was besieged by the Roman forces of Julius Caesar in 52 BC.
The California Gold Rush started in 1848, near San Francisco.
Soldiers of the ancient Macedonian Kingdom were dreaded warriors.
This animation demonstrates the construction of a fire engine.
Saving energy and protecting the environment are important factors in the design of modern office buildings.
In the battle fought at the shores of Hellas, Octavian won a decisive victory over Marcus Antonius.
The geographical distribution of major (world) religions has been influenced by historical events.
Direct action pumps and suction pumps are among the simplest water pumps.
This animation demonstrates the most important equipment of ambulance cars.