Stratovolcanoes consist of layers of volcanic ash, debris and lava.
The two groups of angiosperms are monocots and dicots.
The head's position and movement is detected by the inner ear.
Human blood consists of blood cells and plasma.
This animation demonstrates the development of the human embryo and fetus.
The huge dam built on the Colorado river in the U.S. was named after a former American President.
The German engineer Rudolf Diesel patented the diesel engine in 1893.
This animation demonstrates the structure and operation of electron microscopes.
The double-decked, wide-bodied passenger aircraft can carry more then 500 passengers.
The spinal cord is the part of the central nervous system running inside the spinal column from which spinal nerves branch out.
Soviet labor camps (Gulags) were located far from inhabited areas.
Located in the Grand Mosque of Makkah, the Kaaba shrine is the most sacred site of Islam.
The ancient Roman arena became well-known for the chariot races held here.
The theater that has a distinctive shape and excellent acoustics was situated at the side of the Acropolis in Athens.
This animation shows the symptoms and treatment of secretory otitis media.
The American electrical engineer Edison invented the incandescent light bulb in 1879, which changed our everyday life.
The formation of the Sun and the planets started with the contraction of a dust cloud about 4.5 billion years ago.
The animations demonstrates the structure of a typical flower.
The Olympian gods in ancient Greek mythology were as diverse as humans.
Nuclear fusion will serve as an environmentally friendly and practically unlimited source of energy.