Typical Central European flats in the 1950s consisted of a single room, a kitchen and a bathroom.
Leonardo was not only a master artist, but also an accomplished military engineer.
The polymath thought that if a screw-like structure can rotate fast enough, it will 'drill' into the air and fly.
An exercise about the groups and structure of organic nitrogen compounds.
The mechanical wing is one of the masterpieces among Leonardo's sketches related to aviation.
Leonardo also designed a wide variety of artillery weapons.
Foresters adjusted their lifestyle to the forest environment.
The first paddle steamer in Hungary entered service in 1846.
The aim of this extraordinarily complex study was to mimic the different phases of the flight of birds.
Several different sporting events can be held in an athletics stadium.
Practising the use of the spatial coordinate system with the help of a computer-designed kitchen model.
One of the raw materials of traditional photography.
A compound ion formed when a water molecule releases a proton.
Cellobiose is the basic structural unit of cellulose.
Colourless, toxic liquid with a sweet odour.
An organic compound in the urine of mammals, used in the production of fertilisers as a source of nitrogen.
Benzene is the simplest aromatic hydrocarbon.
The presence of hydronium ions relative to hydroxide ions determines a solution´s pH.
A compound ion produced when sulphuric acid releases protons.
A colourless, heavier-than-air gas. Its geometric isomer is cis-2-butene.