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The ancestors of Arachnida and Crustacea belonged to the class Trilobita.
A group of fish characterized by a cartilaginous skeleton, well-known species include the great white shark and the hammerhead shark.
This animation demonstrates different types of soil.
Several analogous types of eyes have developed independently through convergent evolution.
A prehistoric flying reptile, similar to birds. However, there is no direct evolutionary link between the two.
Trolleybuses and streetcars are environment-friendly means of public transportation
This animation demonstrates the most important equipment of ambulance cars.
This animation explains how a plasma display television works.
This animation demonstrates how a CRT television works.
This animation demonstrates how cell phones work.
The castle of Belgrade (Nándorfehérvár) was one of the most important components in the chain of Hungarian border forts.
Nuclear propulsion was first used by the U.S. Navy for powering submarines in the mid-20th century.
This effective strategy was based on the fast and synchronized attack of different branches of the army.
The warship having several rows of oars was the typical warship of the Hellenistic era.
The legendary M61 class locomotives of the Hungarian State Railways were manufactured by Nohab.
This animation demonstrates the mechanism and operation of record players.
The archaeopteryx shows characteristics of both birds and reptiles. It is probably the ancestor of birds.
Extinct proboscidea closely related to today's elephants, often hunted by prehistoric man.
An air conditioner cools the air inside by drawing heat away and releasing it outside.
Edison's invention records and plays sound from a cylinder, while Berliner's apparatus uses a disc.
The medieval bell tower of the Cathedral of Pisa is the most famous leaning tower of the world.