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Machines powered by animals were mainly used in mills, for grinding grains.
Deinonychus antirrhopus, the 'terrible claw', was a carnivorous dromaeosaurid dinosaur.
The topmost layer of our skin is the epidermis, which contains melanocytes.
Learning about the geographic location, capitals and flags of African countries through exercises in three levels of difficulty.
Learning about the geographic location, capitals and flags of American countries through exercises in three levels of difficulty.
Learning about the geographic location, capitals and flags of Asian countries through exercises with three levels of difficulty.
The inability to differentiate certain shades of colour is called colour vision deficiency.
Polynesians travelled huge distances with their specially designed boats.
A rock relief located in Northeast Bulgaria, probably carved at the end of the 7th century.
The legendary Mongol ruler Genghis Khan established a huge empire through his conquests.
The Rosetta Stone helped to solve the mystery of hieroglyphics.
A differential allows the driven wheels of a car to rotate at different speeds when the car is turning.
This animation presents the states and state capitals of Germany
This animation presents the states and state capitals of Austria.
Eurypterids are an extinct group of Palaeozoic aquatic arthropods.
Emperor Franz Joseph I and the beautiful Elisabeth got married in Vienna in 1854, but their marriage was unfortunately an unhappy one.
The animation presents the largest mountains, plains, rivers, lakes and deserts of the Earth.
This animation presents some interesting facts in physical geography.
This animation presents some interesting facts in social geography.
The Pula Arena, located in present-day Croatia, was one of the largest Roman amphitheatres in the Antiquity.
This stunning castle is situated in northern Croatia.