Karst formations include dolines and dripstones.
A type of sugar found in mammalian milk.
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.
Edison´s invention records and plays sound from a cylinder, while Berliner´s apparatus uses a disc.
The American Civil War was fought between the Confederacy and the Union.
Articulated lorries play an important role in road transport.
Several analogous types of eyes have developed independently through convergent evolution.
This effective strategy was based on the fast and synchronised attack of different branches of the army.
The legendary M61 class locomotives of the Hungarian State Railways were manufactured by Nohab.
Long-necked herbivorous dinosaur with a robust body.
Trolleybuses and trams are environment-friendly means of public transport
A group of fish characterised by a cartilaginous skeleton, well-known species include the great white shark and the great hammerhead shark.
The ancestors of Arachnida and Crustacea belonged to the class Trilobita.
Nuclear propulsion was first used by the US Navy for powering submarines in the mid-20th century.
This animation demonstrates the mechanism and operation of record players.
An air conditioner cools the air inside by drawing heat away and releasing it outside.
The German engineer Otto Lilienthal was the first person to make successful flights with a glider designed by himself.
Entertaining and spectacular animation to practise orientation in space.
A polynucleotid made up of phosphoric acid, ribose, and nucleobases (cytosine, uracil, adenine and guanine).