Scoliosis is a medical condition in which a person's spine has a lateral deviation.
The dodo is an extinct species of birds that used to be native to the island of Mauritius. It has become the symbol of extinction.
The Arctic tern is famous for its long migration route: it flies from the Arctic to the Antarctic and back again each year.
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.
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.
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.
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
The legendary Mongol ruler Genghis Khan established a huge empire through his conquests.
The Rosetta Stone helped to solve the mystery of hieroglyphics.
This animation presents the states and state capitals of Austria.
Emperor Franz Joseph I and the beautiful Elisabeth got married in Vienna in 1854, but their marriage was unfortunately an unhappy one.
Eurypterids are an extinct group of Palaeozoic aquatic arthropods.
This animation presents some interesting facts in physical geography.
The animation presents the largest mountains, plains, rivers, lakes and deserts of the Earth.
