Homo erectus

The ‘upright man’ used tools and could set fire.

Knee joint

The knee joint is made up by the femur, the tibia and the kneecap.

Byzantine Emperor (6th century)

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

The evolution of data storage

The capacity of data storage devices have increased at an incredible rate during the past decades.


One of the most important monocot crops.


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


Observatories are often built at high elevations to minimise the effects of atmospheric turbulence

Tooth brushing

Careful tooth brushing is an important part of oral hygiene.

Amoeba proteus

Widespread heterotrophic unicellular organisms with constantly changing shapes


ATP is the main source of energy for cells.

Ancient Greek pottery

The masterpieces of ancient Greek potters are important archaeological artefacts.

Types of gears

Two meshing gears transmit torque during their rotational motion.

The phosphorus cycle

The phosphorus cycle describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.


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

Oxygen cycle

The oxygen cycle describes the movement of oxygen within its three main reservoirs.

Edible frog

This animation demonstrates the anatomy of amphibians through the example of a common species of frogs.


A fjord is a long, narrow inlet with steep sides, created in a valley carved by glacial activity.


The last Ice Age ended about 13 thousand years ago.


A geyser is a spring characterised by intermittent discharge of water and steam.

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