The highway code contains rules concerning the safety equipment of bicycles.
The invention of the ballpoint pen made writing a lot easier.
A rock relief located in Northeast Bulgaria, probably carved at the end of the 7th century.
The topmost layer of our skin is the epidermis, which contains melanocytes.
The first dwellings in human history provide a lot of information about the lifestyle of our ancestors.
The Chengdu J-20, also known as Mighty Dragon, is a multiple function stealth fighter aircraft.
Radial engines are used primarily in aeroplanes and helicopters.
This animation presents levels of biological organisation from the level of the individual organism to the level of cells.
Adrenaline, also known as epinephrine, is a hormone produced in our body in stressful situations and plays an important role in the fight-or-flight response.
The submarine designed by the Spanish inventor Narcís Monturiol was a pioneering work in the history of underwater navigation.
Concave and convex lenses are used for the correction of short-sightedness and far-sightedness.
English sailing ships were among the best ships in the 17th-19th centuries.
Spanish conquerors owed their success to their armour and firearms.
Dicotyledons have two embryonic leaves (cotyledons), while monototyledons have only one.
The fearsome looking Aztec warriors could not stop the Spanish conquistadors with their primitive weapons.
The outcome of one of the greatest battles in the history of the ancient East (fought by the Egyptians and Hittites) was indecisive.
The fastest track-based means of urban transport.
The ancient city located near the river Euphrates was an important Sumerian centre.
Inhabitants of the northern part of the Netherlands have successfully fought the sea since the Middle Ages.
Producing speech requires the synchronised operation of several cortical centres.