The German triplane was perhaps the best known plane in World War I.
These excellent shipbuilders and sailors travelled great distances on the seas and rivers.
Limestone is a widely and diversely used material.
During the substitution reaction the hydrogen atoms of methane are substituted with chlorine atoms, the by-product is hydrogen chloride.
Fatty acid molecules consist of a polar head and a non-polar tail, therefore they are suitable for removing fat stains.
Hydrogen atoms within hydrogen molecules are held together by a covalent bond.
An exercise about the regular hexahedron built from unit cubes to help deepen your knowledge of cubes.
The device designed to carry out executions more humanely than before was named after a French doctor.
A polynucleotid made up of phosphoric acid, ribose, and nucleobases (cytosine, uracil, adenine and guanine).
An entertaining game about different views of spatial objects.
Jamestown, founded in 1607, was the first permanent English settlement on the east coast of North America.
Typical working-class districts with unhealthy living conditions were built at the time of the Industrial Revolution.
A wide variety of torture devices were in use in medieval dungeons.
A cuboid is a polyhedron with six rectangular faces.
This animation demonstrates the components (vertices, edges, diagonals and faces) of the cube, one of the Platonic solids.
The cannon was an important type of firearms at the beginning of modern history, widespread both on land and water.
The legendary M61 class locomotives of the Hungarian State Railways were manufactured by Nohab.
Medieval Venice owed its wealth to its flourishing maritime trade.
This effective strategy was based on the fast and synchronised attack of different branches of the army.
The work of smiths – one of the first professions in history – became even more important in the Middle Ages.