A compound ion produced from carbonic acid by releasing protons.
One of the most beautiful Art Nouveau buildings in Hungary.
Saving energy and protecting the environment are important factors in the design of modern office buildings.
Direct action pumps and suction pumps are among the simplest water pumps.
Blood vessels in fishes' gills absorb oxygen and release carbon dioxide.
A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.
A beehive tomb on the site of the ancient city of Mycenae, attributed to the legendary king.
The Gaul city Alesia, defended by Vercingetorix, was besieged by the Roman forces of Julius Caesar in 52 BC.
A prehistoric amphibian and an early representative of the Tetrapods, which became extinct 360 million years ago.
A colourful and entertaining animation to practise orientation in space.
Slavic warriors were greatly respected throughout Europe in the Middle Ages.
Villages were the first permanent human settlements
The brain and skull underwent significant changes during human evolution.
Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.
Crystalline allotrope of elemental carbon, the hardest known natural substance.
Groups of western jackdaws are frequently found in cities. Konrad Lorenz analysed the complex social behaviour of these animals.
Change of light conditions in different seasons. Measuring height using shadows.
Plants are capable of converting inorganic substances (carbon dioxide and water) into organic sugar.
The saker falcon is a large bird of prey widespread in Europe and and Asia.
One of the crystalline allotropes of elemental carbon.