The Incas´ rudimentary weapons were inadequate in their struggle against the Spanish Conquistadors.
The oxygen cycle describes the movement of oxygen within its three main reservoirs.
The Aztec Empire was a despotic, militaristic state ruled by the tlatoani.
The knee joint is made up by the femur, the tibia and the kneecap.
A wide variety of optical instruments are in use today, ranging from microscopes to telescopes.
Common ciliated eucaryotic unicellular organisms widespread in freshwaters.
This animation demonstrates how horse chestnut trees change throughout the seasons
The capacity of data storage devices have increased at an incredible rate during the past decades.
Observatories are often built at high elevations to minimise the effects of atmospheric turbulence
ATP is the main source of energy for cells.
The masterpieces of ancient Greek potters are important archaeological artefacts.
The ‘upright man’ used tools and could set fire.
Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.
Viking leaders were elected from tribe members by the right of blood or an act of bravery.
This animation demonstrates the anatomy of amphibians through the example of a common species of frogs.
The phosphorus cycle describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.
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.
System that satisfies consumers’ demands of water supply, wastewater disposal, electricity, heat and gas supply and telecommunication.
A geyser is a spring characterised by intermittent discharge of water and steam.