Phonograph and gramophone

Edison´s invention records and plays sound from a cylinder, while Berliner´s apparatus uses a disc.

Leaning Tower of Pisa (14th century)

The medieval bell tower of the Cathedral of Pisa is the most famous leaning tower of the world.

Quinquereme (3rd century BC)

The warship having several rows of oars was the typical warship of the Hellenistic era.

Blitzkrieg strategy (1939-1940)

This effective strategy was based on the fast and synchronised attack of different branches of the army.

Ictíneo II submarine

The submarine designed by the Spanish inventor Narcís Monturiol was a pioneering work in the history of underwater navigation.

MÁV M61 diesel engine (1963)

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

Muscles of the upper arm

The arms are moved by flexor and extensor muscles.

Bones of the lower limbs

Bones of the lower limbs are connected to the trunk by the pelvis.

How does it work? - Record player

This animation demonstrates the mechanism and operation of record players.

The first days in school

Learn the concept of colours, numbers, letters and shapes while playing

Enzymes

Enzymes are protein molecules catalysing biochemical reactions. Their activity can be regulated.

Carbonic acid (H₂CO₃)

Colourless, odourless liquid produced by dissolving carbon dioxide in water.

Nitric acid (HNO₃)

One of the oxoacids of nitrogen. A colourless compound with a pungent odour, a strong oxidant.

Fullerene (C₆₀)

A crystalline allotrope of carbon which was discovered at the end of the 1980s.

RNA

A polynucleotid made up of phosphoric acid, ribose, and nucleobases (cytosine, uracil, adenine and guanine).

Stearic acid (octadecanoic acid) (C₁₇H₃₅COOH)

Solid, white substance, a constituent of vegetable oils and animal fats.

Conformations of ethane

The staggered conformation of ethane is more stable than the eclipsed conformation.

Lead-acid battery

Electrochemical processes in a lead-acid battery produce electric current.

Cellulose (C₆H₁₀O₅)n

The building material of the cell walls and fibres of plants.

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