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Ships were the first means of transport in history. Even today the transportation of goods is done mainly by ships.
Most species of frogs live near water, however some species have also adapted to extreme circumstances.
Some power plants use fossil and renewable energy simultaneously.
The difference between winter and summer temperatures can cause bridges to contract or expand as much as 20 cm, which is called thermal expansion. To solve the problem a comb-like expansion joint is built into the structure.
Lightning strikes somewhere on Earth every second. This extraordinary phenomenon is a spectacular sight, but at the same time it can be dangerous.
Conspicuous, bright-coloured berries are delicious food for birds but some of them may be poisonous for people.
Hydroelectricity is clean, environmentally friendly and is a natural source of energy. An outstandingly high proportion of the electricity of Norway and Austria is produced this way.
Salt precipitates in dried-out swamps and lakebeds, providing a habitat for unique flora.
Sedimentary rocks are formed from layers of sediment deposited at the bottom of bodies of water and compressed over millions of years.
Farmsteads are groups of agricultural buildings around a family home, surrounded by cultivated land.
Small towns do not get overcrowded like big cities, but they provide a wider range of services than villages.
More than half of the world's population now lives in towns and cities. Large cities are becoming even more crowded.
Adobe walls, thatched roof, small windows, rammed earth floor - these were the characteristics of farmhouses 200 years ago.
Horseshoes are mystical objects; they are thought to bring luck. Watch how the ancient profession of farriers is still practised today.
The raw material of porcelain is kaolin, which is mixed with other substances, most often feldspar and clay.
The origins of Christmas date back to ancient Rome. Decorating Christmas trees became popular in the early 19th century.
This rather bizarre chapel in the Czech Republic furnished with artistically arranged bones leaves no visitor indifferent.
Many people doubt their safety, others consider it practically the most economical source of energy.
The Alps and the Himalayas are mountain ranges that were formed by geological folding. In this video we can watch the end result of the process.
Industrial parks on the outskirts of towns have a huge economic potential. It is more worthwhile to build a factory in an industrial park than far away from it.
In many cultures the traditional ritual of scaring away the winter is still practised, although today the performance is mainly just tourist attraction.
Dripstone is a rock deposited by precipitation from dripping water. The best known forms of dripstone are stalactites, stalagmites and columns.
Caves are underground hollows, formed by natural processes, with a depth of at least 2m. Prehistoric humans often used them as shelters.
Medieval castles had strategic functions. The state they are in today tells us if they have been attacked during the course of history.