There are various types of instruments used for measuring temperature.
This animation presents the provinces and provincial capitals of the Netherlands.
A glacier is a large body of ice that forms from snow, and is in constant, slow motion.
Today called Dubrovnik, this Croatian city is known for its spectacular architecture and beautiful location.
A cuboid is a polyhedron with six rectangular faces.
An entertaining game about different views of spatial objects.
An exercise about the regular hexahedron built from unit cubes to help deepen your knowledge of cubes.
This animation demonstrates the components (vertices, edges, diagonals and faces) of the cube, one of the Platonic solids.
This animation demonstrates various types of cylindrical solids as well as their lateral surfaces.
A group of fish characterised by a cartilaginous skeleton, well-known species include the great white shark and the great hammerhead shark.
This animation demonstrates how an escalator works.
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.
Submarines had an important role in naval warfare as early as World War I.
The boundaries of tectonic plates can be seen on the seafloor.
The German liquid-propellant rocket, developed during WWII, was the first known man-made object to reach space.
The axolotl, also known as Mexican salamander, is an amphibian species that keeps its gills even in adulthood.
Karst formations include dolines and dripstones.
Atmospherical nitrogen is bound by bacteria and used by living organisms in the form of various compounds.
Organs that detect signals of the environment or of the body and transmit them to the brain as nerve impulses.