Bones of the upper limbs form the pectoral girdle and the arms.
The 'wise man' originated in Africa and dispersed throughout most of the continents.
A mushroom is the fleshy fruiting body of a fungus, made up from hyphae.
In benzene there are sigma bonds and delocalised pi bonds between carbon atoms.
Rivers play an important role in shaping the Earth's surface: they cause erosion as well as carrying and depositing sediment.
The Cassini spacecraft was exploring Saturn and its moons for nearly 20 years.
The English engineer George Stephenson’s locomotive was built for a competition of locomotives in 1829.
The excellent road and aqueduct system covering the whole empire reflects well the development of the Roman civilisation.
Major phases in the history of theories and views about the structure of the atom.
Combining a conventional internal combustion engine propulsion system with an electric propulsion system reduces emission.
The reproductive system consists of organs which work together for the purpose of reproduction.
During swallowing food travels from the mouth cavity into the stomach.
The pericarp of real fruits develops from the carpel, while the pericarp of pseudofruits develops from other parts of flowers.
The most important weapons of medieval Arab warriors were the bow and the sword.
The Byzantine Emperor was the head of the Byzantine Empire, the direct continuation of the Roman Empire.
Widespread heterotrophic unicellular organisms with constantly changing shapes
Airports provide infrastructure and services necessary for aviation.
Regular dice can be used for solving statistical and probability exercises.
This animation demonstrates the structure and most important peripherals of desktop computers.
Ports must provide necessary infrastructure and services for industry and marine transport.