Honeybees produce a sweet and nutritious substance, honey.
Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.
This animation presents the provinces and provincial capitals of the Netherlands.
Organs that detect signals of the environment or of the body and transmit them to the brain as nerve impulses.
Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.
An ant colony consist of a queen, male ants and workers.
Synovial joints can be categorised by the direction of movement they allow.
Careful tooth brushing is an important part of oral hygiene.
Practice the Russian alphabet, build words from letters.
The reproductive system consists of organs which work together for the purpose of reproduction.
The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion stars, one of which is our Sun.
These special dolmens located in present-day Netherlands were built about 5,000 years ago.
Ports must provide necessary infrastructure and services for industry and marine transportation.
The Emperor of the vast Far-Eastern empire was the lord of life and death.
The Hussites mastered the use of war wagons in the 15th century.
This animation demonstrates the anatomy of birds through the example of mallards.
Many of the most important food crops we consume belong to the family of nightshades.
Airports provide infrastructure and services necessary for aviation.
The water supply system provides clean and safe drinking water for the consumers.
This 3D scene explains the correlation between the ratio of similarity and the ratio of volume of geometric solids.