We can travel on dual carriageways on the motorway.
This animation demonstrates the structure of nitrogen molecules, with one sigma and two...
The popular model of the American automobile factory was the first mass-produced car in...
Шахматните задачи спомагат за развиването на логично мислене.
Ancient Egyptians worshipped a large number of gods and goddesses.
A selection of legendary buildings from the history of civilisation.
This animation demonstrates the structure and operation of electron microscopes.
This animation shows the electron configuration of the calcium atom.
In benzene there are sigma bonds and delocalised pi bonds between carbon atoms.
The English engineer George Stephenson’s locomotive was built for a competition of...
Съветските трудови лагери (Гулаг) са били разположени далеч от населените области.
The Wright Flyer was the first successful powered, heavier-than-air aircraft, designed...
Поради наклона на земната ос слънчевите лъчи падат под различен ъгъл през годината.
A Zeppelin is a type of rigid-framed airship.
This animation introduces body parts on a male anatomical model.
На 12 април 1961 г. от съветския космодрум Байконур излита космическият кораб „Восток-1“...
The intriguing history of this historic castle spans nearly a thousand years.
Carrier of genetic information in cells.
A wooden church built in the 12th-13th centuries, the best preserved of Norway´s stave...
The 'wise man' originated in Africa and dispersed throughout most of the continents.