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The ribs, the sternum and the spinal column form the skeleton of the chest.
Eukaryotic cells contain a number of organelles.
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 difference between the temperature of the polar and equatorial zones causes atmospheric circulation which is affected by a number of factors, including...
A type of steam locomotives used by British Railways were manufactured in the 1950s.
Neil Armstrong, one of the crew members of Apollo 11 was the first man to set foot on the Moon.
The Internet allows us to send data quickly to large distances.
Space probes and Mars rovers examine the structure of Mars and possible traces of life.
Candles have been used for lighting since ancient times.
Medieval townhouses were built from stone or brick and were several storeys high.
The B-24 Liberator was an American heavy bomber aircraft, built in large numbers, that was used on every front during World War II.
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.
The geographic coordinate system enables every location on the Earth to be exactly specified.
The primary duty of these Japanese warriors was to serve their feudal lords, even at the cost of their own lives.
The diameter of the Sun is about 109 times that of the Earth. Most of its mass consists of hydrogen.
The structure and arrangement of polypeptide chains affects the spatial structure of proteins.
The Earth is composed of several spherical layers.