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The structure and arrangement of polypeptide chains affects the spatial structure of proteins.
This animation demonstrates the functioning of the 3 basic types of water tap.
This animation introduces the most important systems of the human body.
Bottlenose dolphins are sea mammals which use ultrasound for orientation.
Bacteria occur in a wide range of shapes, including spheres, rods and spirals.
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.
Medieval townhouses were built from stone or brick and were several storeys high.
A type of steam locomotives used by British Railways were manufactured in the 1950s.
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...
The primary duty of these Japanese warriors was to serve their feudal lords, even at the cost of their own lives.
Life magazine picked Gutenberg's invention of mechanical movable type printing as the most important event of the second millennium.
RMS Titanic was the largest passenger ship at the beginning of the 20th century.
The diameter of the Sun is about 109 times that of the Earth. Most of its mass consists of hydrogen.
The Earth is composed of several spherical layers.
The pancreas and the liver empty digestive juices into the duodenum.
The orbits of the 8 planets in our Solar System are elliptical.
Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes continuously changes during the year.