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The medieval bell tower of the Cathedral of Pisa is the most famous leaning tower of the world.
The warship having several rows of oars was the typical warship of the Hellenistic era.
This effective strategy was based on the fast and synchronised attack of different branches of the army.
The submarine designed by the Spanish inventor Narcís Monturiol was a pioneering work in the history of underwater navigation.
The legendary M61 class locomotives of the Hungarian State Railways were manufactured by Nohab.
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 serves for the removal of harmful and useless materials from the body.
Concave and convex lenses are used for the correction of short-sightedness and far-sightedness.
A white, water-soluble, sweet compound known as sugar.
Enzymes are protein molecules catalysing biochemical reactions. Their activity can be regulated.
Colourless, odourless liquid produced by dissolving carbon dioxide in water.
One of the oxoacids of nitrogen. A colourless compound with a pungent odour, a strong oxidant.
A crystalline allotrope of carbon which was discovered at the end of the 1980s.
A polynucleotid made up of phosphoric acid, ribose, and nucleobases (cytosine, uracil, adenine and guanine).
Solid, white substance, a constituent of vegetable oils and animal fats.
The staggered conformation of ethane is more stable than the eclipsed conformation.
The building material of the cell walls and fibres of plants.
Electrochemical processes in a lead-acid battery produce electric current.
Learn the concept of colours, numbers, letters and shapes while playing
More than one million people died in the WWII Nazi death camp located in present-day Poland.