The ancestors of Arachnida and Crustacea belonged to the class Trilobita.
A group of fish characterised by a cartilaginous skeleton, well-known species include the great white shark and the great hammerhead shark.
Several analogous types of eyes have developed independently through convergent evolution.
Một loài bò sát biết bay giống với loài chim, sống trong thời tiền sử. Tuy nhiên giữa chúng và loài chim không tồn tại liên kết tiến hóa trực tiếp.
Trolleybuses and trams are environment-friendly means of public transport
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 mobile 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 US Navy for powering submarines in the mid-20th century.
This effective strategy was based on the fast and synchronised 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.
Chim cổ cho thấy những đặc điểm của cả chim và bò sát. Chúng có khả năng là tổ tiên của các loài chim.
Động vật bộ vòi đã tuyệt chủng có liên quan mật thiết với loài voi ngày nay, thường bị người tiền sử săn bắt.
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.