Bones of the upper limbs

Bones of the upper limbs form the pectoral girdle and the arms.

The spread of Homo sapiens on Earth

The 'wise man' originated in Africa and dispersed throughout most of the continents.

Mushrooms

A mushroom is the fleshy fruiting body of a fungus, made up from hyphae.

Covalent bonds in benzene molecules

In benzene there are sigma bonds and delocalised pi bonds between carbon atoms.

Rivers and landforms

Rivers play an important role in shaping the Earth's surface: they cause erosion as well as carrying and depositing sediment.

The Cassini-Huygens Mission (1997-2017)

The Cassini spacecraft was exploring Saturn and its moons for nearly 20 years.

Stephenson’s Rocket (1829)

The English engineer George Stephenson’s locomotive was built for a competition of locomotives in 1829.

Ancient Roman aqueduct and road

The excellent road and aqueduct system covering the whole empire reflects well the development of the Roman civilisation.

Development of the atomic model

Major phases in the history of theories and views about the structure of the atom.

Environmentally friendly vehicles

Combining a conventional internal combustion engine propulsion system with an electric propulsion system reduces emission.

Male reproductive system

The reproductive system consists of organs which work together for the purpose of reproduction.

The upper gastrointestinal tract

During swallowing food travels from the mouth cavity into the stomach.

Comparison of real fruits and pseudofruits

The pericarp of real fruits develops from the carpel, while the pericarp of pseudofruits develops from other parts of flowers.

Arab warrior (6th century)

The most important weapons of medieval Arab warriors were the bow and the sword.

Byzantine Emperor (6th century)

The Byzantine Emperor was the head of the Byzantine Empire, the direct continuation of the Roman Empire.

Amoeba proteus

Widespread heterotrophic unicellular organisms with constantly changing shapes

Airport

Airports provide infrastructure and services necessary for aviation.

Dice

Regular dice can be used for solving statistical and probability exercises.

Desktop computer

This animation demonstrates the structure and most important peripherals of desktop computers.

Port

Ports must provide necessary infrastructure and services for industry and marine transport.

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