The concentration camp established on Polish territory was the administrative centre of a huge camp complex.
Tankai buvo svarbiausia kovos sausumoje mašina Antrojo pasaulinio karo metais.
Hero of Alexandria is the inventor of the first steam engine, although he regarded it as an entertaining toy.
The invention of the ballpoint pen made writing a lot easier.
The highway code contains rules concerning the safety equipment of bicycles.
The changing bicycle, at first mocked as a toy, is a true mirror of the technical development over the last three centuries.
During its orbit around the Earth, the visibility of the Moon's illuminated part constantly changes.
Thermal power stations convert energy released during the combustion of fossil fuels or renewable resources into electricity.
The animation presents the main air, water and land routes and transport hubs.
During freezing hydrogen bonds are formed between water molecules resulting in a crystal structure.
Large-scale ammonia production requires high temperature and pressure and the presence of iron as a catalyst.
Ammonium chloride is the result of the reaction of ammonia and hydrogen chloride
The dissolution of zinc in hydrochloric acid produces hydrogen gas.
The solution of hydrogen chloride in water is called hydrochloric acid.
Knallgas is the mixture of hydrogen and oxygen. It will explode when ignited.
Common salt is dissolved by water: polar water molecules form a coat around the ions.
Polymerised ethylene is known as polyethylene, a type of plastic.
Geothermal power stations convert energy of hot, high-pressure water found in deeper layers of the Earth into electricity.
The cathedral named after the Assumption of Mary into Heaven is one of the gems of French Gothic architecture.
The most important Neoclassicist building in France, completed in 1791, became the final resting place of many of France´s greats.