Safety equipment of bicycles

The highway code contains rules concerning the safety equipment of bicycles.

How does it work? - Ballpoint pen

The invention of the ballpoint pen made writing a lot easier.

The Madara rider

A rock relief located in Northeast Bulgaria, probably carved at the end of the 7th century.

Tanning, skin cancer

The topmost layer of our skin is the epidermis, which contains melanocytes.

Palaeolithic cave

The first dwellings in human history provide a lot of information about the lifestyle of our ancestors.

Chengdu J-20 Mighty Dragon (China, 2017)

The Chengdu J-20, also known as Mighty Dragon, is a multiple function stealth fighter aircraft.

Radial engine

Radial engines are used primarily in aeroplanes and helicopters.

Levels of biological organisation

This animation presents levels of biological organisation from the level of the individual organism to the level of cells.

Adrenaline (advanced)

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.

Ictíneo II submarine

The submarine designed by the Spanish inventor Narcís Monturiol was a pioneering work in the history of underwater navigation.

Vision correction

Concave and convex lenses are used for the correction of short-sightedness and far-sightedness.

English battleship (18th century)

English sailing ships were among the best ships in the 17th-19th centuries.

Conquistador (16th century)

Spanish conquerors owed their success to their armour and firearms.

Seeds and germination

Dicotyledons have two embryonic leaves (cotyledons), while monototyledons have only one.

Aztec warriors (15th century)

The fearsome looking Aztec warriors could not stop the Spanish conquistadors with their primitive weapons.

Battle of Kadesh (1285 BC)

The outcome of one of the greatest battles in the history of the ancient East (fought by the Egyptians and Hittites) was indecisive.

Metro

The fastest track-based means of urban transport.

The city of Ur (3rd millennium BC)

The ancient city located near the river Euphrates was an important Sumerian centre.

Land reclamation in the Netherlands, 17th century

Inhabitants of the northern part of the Netherlands have successfully fought the sea since the Middle Ages.

Cortical organisation of speech

Producing speech requires the synchronised operation of several cortical centres.

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