The ‘upright man’ used tools and could set fire.
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 anatomy of amphibians through the example of a common species of frogs.
The water supply system provides clean and safe drinking water for the consumers.
Igloos were the typical dwellings built by Eskimos living in the Arctic zone.
This animation demonstrates the main sources of air pollution: agriculture, industry and urban settlements.
The masterpieces of ancient Greek potters are important archaeological artefacts.
NAD⁺ is a coenzyme that plays an important role mainly in catabolic processes, while NADP is important in anabolic processes as hydrogen carriers.
The pericarp of real fruits develops from the carpel, while the pericarp of pseudofruits develops from other parts of flowers.
Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group of Eumetazoans.
The most ancient group of animals, they live underwater, lack real tissues and body symmetry.
The three main types of blood vessels in the human body are the arteries, the veins, and the capillaries.
A game to practise the use of analogue and digital clocks.
To calculate the volume of a tetrahedron we start by calculating the volume of a prism.
Groundwater and aquifers are types of underground waters.
A periodic climate pattern that occurs across the tropical Pacific Ocean every five years.
The Crow are Native Americans who inhabited the Yellowstone River valley.
This animation demonstrates how horse chestnut trees change throughout the seasons
The United States entered World War II after the devastating attack by the Japanese navy.
Synovial joints can be categorised by the direction of movement they allow.