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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.

The skull and the spine

The two main parts of the central nervous system, the brain and the spinal cord are protected by the skull and the spinal column.

The urinary system

The urinary system serves for the removal of harmful and useless materials from the body.

Vision correction

Concave and convex lenses are used for the correction of short-sightedness and far-sightedness.

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.

Cellulose (C₆H₁₀O₅)n

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

Lead-acid battery

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

The first days in school

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

Auschwitz-Birkenau concentration camp

More than one million people died in the WWII Nazi death camp located in present-day Poland.

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