This animation presents the provinces and provincial capitals of the Netherlands.
This stunning castle is situated in northern Croatia.
Structures consisting of enormous stone blocks, dating back thousands of years, are monuments of megalithic cultures.
A regular square pyramid is a right pyramid with a square base and four triangular faces.
Highly committed Japanese soldiers fought primarily at the Asian and Pacific theatres of the Second World War.
A transformer is a device used for converting the voltage of electric current.
Industrial estates provide infrastructure and services for companies.
An extinct group of Cephalopoda, with solid external skeletons. They are excellent index fossils.
A mammal with features typical of reptiles: it lays eggs and has a cloaca.
A spacecraft on its path is in a constant state of free fall.
As opposed to opencast mines, in underground mines the layers covering coal are not removed, coal is extracted from mine shafts.
Before the American Civil war the use of slaves on plantations was typical in the Southern states.
The church consecrated to Saint Basil was commissioned by Ivan the Terrible.
This animation demonstrates different types of soil.
The archaeopteryx shows characteristics of both birds and reptiles. It is probably the ancestor of birds.
A prehistoric flying reptile, similar to birds. However, there is no direct evolutionary link between the two.
This animation demonstrates the structure and operation of digital cameras.
Smoking severely damages the respiratory system, it may cause COPD or lung cancer.
Marine mammals, the largest known animals to have ever existed.
Penguins are birds living in the Antarctic and adapted to cold temperature and swimming.