The difference between the temperature of the polar and equatorial zones causes atmospheric circulation which is affected by a number of factors, including...
The diameter of the Sun is about 109 times that of the Earth. Most of its mass consists of hydrogen.
Life magazine picked Gutenberg's invention of mechanical movable type printing as the most important event of the second millennium.
The International Space Station is a habitable satellite built with the cooperation of 16 countries.
While generators convert mechanical energy into electrical energy, electric motors convert electrical energy into mechanical energy.
The animation shows the traditional Japanese wooden townhouse, the machiya.
Commercial maritime routes of container ships form a global network.
The French Montgolfier brothers were the first pioneers of flying.
The pancreas and the liver empty digestive juices into the duodenum.
The B-24 Liberator was an American heavy bomber aircraft, built in large numbers, that was used on every front during World War II.
Medieval townhouses were built from stone or brick and were several storeys high.
This animation demonstrates Sir Isaac Newton's three laws of motion that laid the foundation for classical mechanics.
The train operates between Paris and southern Germany, its cruise speed is 320 km/h.
A symbol of division and oppression, the Wall tore a city and numerous families apart.
In transmission systems, the engine torque is modified by reducing or increasing rotational speed.
The world famous monument in England still poses mysteries for archaeologist.
The average house in Ancient Greece had a rectangular, geometrical floor plan and two storeys.
The army of Alexander the Great successfully deployed siege towers in its attacks against fortifications.
Wealthy citizens in ancient Rome owned large houses with varied layouts of several rooms.
This creative animation contains several 3D objects for colouring.