This animation presents the history of Ancient Rome throughout the centuries.
The name of the Russian armoured cruiser became well known during the October Revolution of 1917.
Extinct proboscidea closely related to today's elephants, often hunted by prehistoric man.
One of the most common tree of the pine family, native to Eurasia.
Robert Fulton American engineer created the first operational steam-powered ship.
Numerous legendary empires were built (and destroyed) in the course of history.
The German triplane was perhaps the best known plane in World War I.
Schooners, first built in the Netherlands in the 17th century, were mainly used as merchant ships.
From the 1940s, the increasingly large aircraft carriers became the masters of the oceans.
A bireme is a type of ancient warship, with a characteristic pointed bow and two decks of oars, used by many armies.
The fat-tailed scorpion is one of the world's most dangerous scorpions.
One of the oxoacids of nitrogen. Colourless, moderate acid with a pungent odour, that exists only in aqueous solution.
A compound formed as white smoke during the combustion of phosphorus.
This animation presents some interesting facts in social geography.
Pearls, often used as gemstones, are the by-products of certain molluscs' protective mechanisms.
Trolleybuses and trams are environment-friendly means of public transport
Large-scale ammonia production requires high temperature and pressure and the presence of iron as a catalyst.
This animation demonstrates the components (vertices, edges, diagonals and faces) of the cube, one of the Platonic solids.
An exercise about the regular hexahedron built from unit cubes to help deepen your knowledge of cubes.
An entertaining game about different views of spatial objects.