Lymph vessels carry lymph to the blood vessels, while lymph nodes are integral parts of the immune system.
The pancreas and the liver empty digestive juices into the duodenum.
The eye is one of our most important sense organs. When stimulated by light, electric impulses are produced by its receptors.
The International Space Station is a habitable satellite built with the cooperation of 16 countries.
The Troll A is an offshore natural gas platform, the largest offshore platform ever built: it rises about 170 metres above water level, weighs 656,000...
Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes continuously changes during the year.
A type of steam locomotives used by British Railways were manufactured in the 1950s.
The orbits of the 8 planets in our Solar System are elliptical.
The Earth is composed of several spherical layers.
Space probes and Mars rovers examine the structure of Mars and possible traces of life.
The diameter of the Sun is about 109 times that of the Earth. Most of its mass consists of hydrogen.
The inflammation of the vermiform appendix, which is connected to the cecum, requires immediate surgical intervention. The animation shows the cause and...
Life magazine picked Gutenberg's invention of mechanical movable type printing as the most important event of the second millennium.
Aluminium smelting is the process of extracting aluminium from alumina by electrolysis.
The structure and arrangement of polypeptide chains affects the spatial structure of proteins.
The B-24 Liberator was an American heavy bomber aircraft, built in large numbers, that was used on every front during World War II.
This animation demonstrates the development of the axe throughout archaeological periods.
Medieval townhouses were built from stone or brick and were several storeys high.
One of the best known buildings in the world, this is the residence and office of the President of the United States.
The Rutherford Experiment proved the existence of positively charged atomic nuclei. The results led to the elaboration of a new atomic model.