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A game to practise the use of analogue and digital clocks.
A fjord is a long, narrow inlet with steep sides, created in a valley carved by glacial activity.
The three main types of blood vessels in the human body are the arteries, the veins, and the capillaries.
The ‘upright man’ used tools and could set fire.
NAD⁺ is a coenzyme that plays an important role mainly in catabolic processes, while NADP is important in anabolic processes as hydrogen carriers.
Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.
This animation demonstrates the main sources of air pollution: agriculture, industry and urban settlements.
The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion stars, one of which is our Sun.
This animation demonstrates the structure and most important peripherals of desktop computers.
Igloos were the typical dwellings built by Eskimos living in the Arctic zone.
The knee joint is made up by the femur, the tibia and the kneecap.
The water supply system provides clean and safe drinking water for the consumers.
Airports provide infrastructure and services necessary for aviation.
The Byzantine Emperor was the head of the Byzantine Empire, the direct continuation of the Roman Empire.
An ant colony consist of a queen, male ants and workers.
Ports must provide necessary infrastructure and services for industry and marine transport.
The river and marine sailing boats of ancient Egypt were one-masted, oared boats
The migration of large human populations began in Ancient times.
ATP is the main source of energy for cells.
Careful tooth brushing is an important part of oral hygiene.