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This video demonstrates the expansion of gases with the help of a bottle and a coin.
Birds are warm-blooded animals that lay hard-shelled eggs. The eggshell is made mostly of calcium carbonate.
Santa Claus lives in Finland in the town of Rovaniemi on the Arctic Circle. Every year in December he departs from here on his journey around the globe.
Libraries have always been a vital part of the community. Beside access to books, modern libraries also provide access to digital resources, such as video...
Welding is a fabrication or sculptural process that joins materials, usually metals, by fusion.
Certain social groups are not able to break out of their lifestyle forced upon them by prejudices and discrimination, so their standard of living remains low.
When the population of a town increases drastically, mass housing needs can only be satisfied with cheap solutions.
Many people doubt their safety, others consider it practically the most economical source of energy.
Some power plants use fossil and renewable energy simultaneously.
Among the problems of a crowded metropolis are the surrounding slums, homelessness and air pollution.
After World War II, Germany was divided and the Iron Curtain was drawn.
The largest cities in the world are often characterised by congestion and high population density.
In certain intersections traffic can be so heavy that safe crossing can only be ensured by traffic lights.
This video shows why the Barbary sheep on the savannahs bear such a strong resemblance to goats.
Species of the Ursidae family can be found all around the world. They are mostly large-bodied with quite diverse diets.
As humans began to conquer all the dry lands, the population of mammoths dropped drastically. They became extinct by the beginning of the Holocene.
This video is about birds of prey that hunt mainly vertebrates.
The most significant city of the ancient world was Rome. During the era of the Roman Empire, the city already had a population of at least 1 million.
The institutions of the European Union are located in different cities. Let’s take a look inside the seat of the European Parliament in Strasbourg.
Mirages can be seen on hot summer days. This phenomenon is caused by the air warming up close to the surface.