One of the most important religious military orders, formed in the era of the Crusades.
The name of the Russian armoured cruiser became well known during the October Revolution of 1917.
Edges, diagonals and faces of a cube can be identified by its vertices.
One of the most common types of flatworms.
Learn the concept of colours, numbers, letters and shapes while playing
Direct action pumps and suction pumps are among the simplest water pumps.
Based on their life cycle, insects can be grouped into three categories: ametabolous, hemimetabolous or holometabolous insects.
The small passenger aircraft is designed for speed, convenience and economical operation.
Threshing machines are used for separating grains from straw.
The Rietveld Schröder House, located in the town of Utrecht in the Netherlands, can be considered a forerunner of modern houses.
Change of light conditions in different seasons. Measuring height using shadows.
A colourful and entertaining animation to practise orientation in space.
Amino acids that make up proteins are bound by peptide bonds.
Influenced by Western Europe, the Tsar attempted to modernise the Russian Empire.
Crystalline allotrope of elemental carbon, the hardest known natural substance.
Otters are semi-aquatic predatory mammals.
Central European farmhouses in the 19th century had characteristic interior and exterior.
Because of the military conflict in Sudan, millions of people had to flee their homes.
Hans Christian Andersen´s legendary character comes to life in a diorama.
A variety of peripherals can be used with laptop computers.