Groups of western jackdaws are frequently found in cities. Konrad Lorenz analysed the complex social behaviour of these animals.
A type of settlement that has central functions.
The dreaded warriors of the Mongol Empire helped to make it one of the largest empires in history.
Television, invented in the early 20th century, became one of the basic forms of entertainment.
Living fossil, important stage in the evolution of tetrapods.
Three-dimensional assembly puzzle with solutions.
German sordiers in the First World War were well trained and used modern weapons.
Extinct species of fish which had thick ´armour´ protecting the head.
This animation demonstrates how a washing machine works.
The Rietveld Schröder House, located in the town of Utrecht in the Netherlands, can be considered a forerunner of modern houses.
According to the Bible Noah was ordered by God to build a large vessel to save his family and the animals from the flood
American soldiers fought in almost all major theatres of World War II.
Find views and nets of three-dimensional shapes.
The B-2 Spirit heavy stealth bomber was deployed in the Balkan war, Afghanistan and Iraq.
This animation demonstrates how sonar works.
The Fighting Falcon is the most successful aircraft in the category of multi-purpose fighters.
The Soviet-made twin-engine interceptor aircraft was first deployed in 1982.
This animation demonstrates the use of modern technology in agriculture.
Burj Al Arab, the world's only seven-star luxury hotel is located in the United Arab Emirates.
The Jumbo Jet is one of the best known airliners.