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 English engineer George Stephenson’s locomotive was built for a competition of locomotives in 1829.
The popular model of the American automobile factory was the first mass-produced car in the world.
The Cassini spacecraft was exploring Saturn and its moons for nearly 20 years.
Major phases in the history of theories and views about the structure of the atom.
As a result of the revolutionary advances in the Neolithic, settling human communities established the first lasting settlements.
This animation demonstrates the anatomy of birds through the example of mallards.
Airports provide infrastructure and services necessary for aviation.
This animation demonstrates the main sources of air pollution: agriculture, industry and urban settlements.
The Incas´ rudimentary weapons were inadequate in their struggle against the Spanish Conquistadors.
The most important weapons of medieval Arab warriors were the bow and the sword.
In summer, monsoon winds bring heavy rainfall from the ocean to the continent.
This animation demonstrates the structure and most important peripherals of desktop computers.
A wide variety of optical instruments are in use today, ranging from microscopes to telescopes.
During swallowing food travels from the mouth cavity into the stomach.
Common ciliated eucaryotic unicellular organisms widespread in freshwaters.