Safety equipment of bicycles

The highway code contains rules concerning the safety equipment of bicycles.

How does it work? - Ballpoint pen

The invention of the ballpoint pen made writing a lot easier.

Hero’s aeolipile

Hero of Alexandria is the inventor of the first steam engine, although he regarded it as an entertaining toy.

MÁV M61 diesel engine (1963)

The legendary M61 class locomotives of the Hungarian State Railways were manufactured by Nohab.

Tanks (World War II)

The main protagonists of World War II were tanks.

Papermaking

Paper was invented more than two thousand years ago.

Palace of Charlemagne (Aachen 9th century)

The palace of Charlemagne was not only the centre of his empire, but also a centre of culture.

Apple tree

The apple is one of the most popular fruits around the world.

How does it work? - Record player

This animation demonstrates the mechanism and operation of record players.

How does it work? - Air conditioner

An air conditioner cools the air inside by drawing heat away and releasing it outside.

Venus

Venus is the 2nd planet from the Sun, the brightest object on the night sky (after the Moon).

Reaction of zinc with hydrochloric acid

The dissolution of zinc in hydrochloric acid produces hydrogen gas.

Producing ammonia from nitrogen gas and hydrogen gas

Large-scale ammonia production requires high temperature and pressure and the presence of iron as a catalyst.

Farming techniques

Farming techniques evolved with the development of human civilisation in the Middle Ages and the Modern Age.

Russian alphabet game

Practise the Russian alphabet, build words from letters.

Great Mosque of Djenné (1907)

The mosque, built in a distinctive architectural style, is the largest adobe structure in the world.

Wind power station

Wind power stations convert the kinetic energy of the wind into electricity.

Limbic system

The limbic system plays an important role in forming emotions and in learning.

Ratio of volumes of similar solids

This 3D scene explains the correlation between the ratio of similarity and the ratio of volume of geometric solids.

Ukrainian Cossack (17th century)

Cossacks, members of independent semi-military communities, played an important role in the history of Ukraine.

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