The simplest of the aromatic carboxylic acids.
One of the halogens, it may cause skin irritation.
The monomer of PVC.
A compound ion generated when a proton is added to an ammonia molecule.
The simplest aldehyde.
A biologically and practically important organic compound.
Farming consists of special agricultural activities.
Chloromethane can be prepared by heating a mixture of methane and chlorine.
The structure and density of farms and villages depend on the geographical features of the region.
One of the most important esters, produced by the reaction of ethanol and acetic acid.
Fish-like marine dinosaurs which resembled dolphins; a good example of convergent evolution.
Hungarian engineer János Csonka built his first automobiles for the Hungarian Postal Service.
The aim of this extraordinarily complex study was to mimic the different phases of the flight of birds.
Narrow streets and colourful houses gave medieval towns a special atmosphere.
Buses play an important role in public transport.
Dresses reflect the lifestyles and culture of the given era and region.
A triangular earth fortification, used by the leader of one of the old Hungarian tribes at the time of the Hungarian conquest.
The leader of the Ottoman Empire was the Sultan, the lord of life and death.
This animation demonstrates various types of cuboids through everyday objects.
The infantry of the Habsburg Empire were deployed in numerous battles.