Euler's polyhedron formula

The theorem formulated by Leonhard Euler describes one of the basic properties of convex polyhedra.

How do fish breathe?

Blood vessels in fishes' gills absorb oxygen and release carbon dioxide.

Battle of Lepanto (1571)

The Ottoman fleet suffered a catastrophic defeat by the fleet of the Holy League.

Archimedes’ screw (3rd century B.C.)

The screw pump commonly attributed to Archimedes made irrigation much more effective

Belgrade (15th century)

The castle of Belgrade (Nándorfehérvár) was one of the most important components in the chain of Hungarian border forts.

Oxygen (O₂) (intermediate)

A colorless, odorless gas, an important component of the atmosphere, indispensable to sustain terrestrial life.

European ground squirrel

Subterranean rodents widespread in Central- and Eastern Europe.

German soldier (World War II)

Soldiers of the Wehrmacht in World War II were well-trained and well-equipped with modern weapons.

Western jackdaw

Groups of western jackdaws are frequently found in cities. Konrad Lorenz analysed the complex social behaviour of these animals.

Sputnik 1 (1957)

The Soviet-made satellite was the first spacecraft to be launched into outer space (in October 1957).

Carbonate ion (CO₃²⁻)

A compound ion produced from carbonic acid by releasing protons.

Mongol warrior (13th century)

The dreaded warriors of the Mongol Empire helped to make it one of the largest empires in history.

European colonization of the Americas (up to 1763)

Several European countries joined the conquest of the New World, making America a colorful continent.

Graphite

One of the crystalline allotropes of elemental carbon.

States and cities of the USA

This animation demonstrates the states and largest cities of the USA.

Forms of government and official state languages

The animation shows the forms of government and official languages of the world´s countries.

Shadows

Change of light conditions in different seasons. Measuring height using shadows.

Moon radar experiment (Zoltán Bay, 1946)

In 1946 a Hungarian scientist was the first person to detect radar echoes from the Moon.

Ichthyosaur

Fish-like marine dinosaurs which resembled dolphins; a good example of convergent evolution.

Typical Central European apartment in the 1950s

Typical Central European apartments in the 1950s consisted of a single room, a kitchen and a bathroom.

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