The changing bicycle, at first mocked as a toy, is a true mirror of the technical development over the last three centuries.
Possible traces of water and life are sought on Mars.
Nuclear propulsion was first used by the US Navy for powering submarines in the mid-20th century.
The ancestors of Arachnida and Crustacea belonged to the class Trilobita.
Building 3D shapes into a given cube mesh with the help of several views.
The fearsome looking Aztec warriors could not stop the Spanish conquistadors with their primitive weapons.
Edison´s invention records and plays sound from a cylinder, while Berliner´s apparatus uses a disc.
Submarines submerge and surface by changing the average density of the hull.
The outcome of one of the greatest battles in the history of the ancient East (fought by the Egyptians and Hittites) was indecisive.
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.
This animation demonstrates how an escalator works.
Due to their asymmetrical profile of the wings, lift is produced while flying at a high speed.
Mercury is innermost and smallest planet of the Solar System.
One of the most important religious military orders, formed in the era of the Crusades.
The legendary M61 class locomotives of the Hungarian State Railways were manufactured by Nohab.
Solid, white substance, a constituent of vegetable oils and animal fats.
Jupiter is the largest planet of the Solar System, it has two and a half times the mass of all the other planets combined.
The highway code contains rules concerning the safety equipment of bicycles.