The theorem formulated by Leonhard Euler describes one of the basic properties of convex polyhedra.
Blood vessels in fishes' gills absorb oxygen and release carbon dioxide.
The Ottoman fleet suffered a catastrophic defeat by the fleet of the Holy League.
The screw pump commonly attributed to Archimedes made irrigation much more effective
The castle of Belgrade (Nándorfehérvár) was one of the most important components in the chain of Hungarian border forts.
A colorless, odorless gas, an important component of the atmosphere, indispensable to sustain terrestrial life.
Subterranean rodents widespread in Central- and Eastern Europe.
Soldiers of the Wehrmacht in World War II were well-trained and well-equipped with modern weapons.
Groups of western jackdaws are frequently found in cities. Konrad Lorenz analysed the complex social behaviour of these animals.
The Soviet-made satellite was the first spacecraft to be launched into outer space (in October 1957).
A compound ion produced from carbonic acid by releasing protons.
The dreaded warriors of the Mongol Empire helped to make it one of the largest empires in history.
Several European countries joined the conquest of the New World, making America a colorful continent.
One of the crystalline allotropes of elemental carbon.
This animation demonstrates the states and largest cities of the USA.
The animation shows the forms of government and official languages of the world´s countries.
Change of light conditions in different seasons. Measuring height using shadows.
In 1946 a Hungarian scientist was the first person to detect radar echoes from the Moon.
Fish-like marine dinosaurs which resembled dolphins; a good example of convergent evolution.
Typical Central European apartments in the 1950s consisted of a single room, a kitchen and a bathroom.