The changing bicycle, at first mocked as a toy, is a true mirror of the technical development over the last three centuries.
Building 3D shapes into a given cube mesh with the help of several views.
The animation presents the main air, water and land routes and transport hubs.
The highway code contains rules concerning the safety equipment of bicycles.
The invention of the ballpoint pen made writing a lot easier.
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.
Machinery that pumps crude oil to the surface
Thermal power stations convert energy released during the combustion of fossil fuels or renewable resources into electricity.
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.
During freezing hydrogen bonds are formed between water molecules resulting in a crystal structure.
The solution of hydrogen chloride in water is called hydrochloric acid.
The dissolution of zinc in hydrochloric acid produces hydrogen gas.
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
Polymerised ethylene is known as polyethylene, a type of plastic.
The cathedral named after the Assumption of Mary into Heaven is one of the gems of French Gothic architecture.
Moles are small subterranean mammals with modified, spade-like forelegs.
The length of the metal frameworks of bridges change when the temperature changes.