Today only one of the Wonders of the Ancient World is still intact: the Pyramids of Giza.
The step pyramid, built in the 27th century BC, was the first pyramid in Egypt.
Mitosis is the process by which a eukaryotic cell divides into two cells and the number of chromosomes remains unchanged.
The Moon is the Earth's only natural satellite
The animation shows five outstanding works in the history of sculpture.
The first supersonic passenger airliner entered service in 1976.
Hotspots are areas of the Earth´s crust where magma often rises to the surface and causes volcanic activity.
Commercial maritime routes of container ships form a global network.
The name of this magnificent palace complex originates in Arabic and means 'the red one'.
The centre of the Indian mausoleum complex is a white marble tomb built by Shah Jahan for his beloved wife.
The battleship USS Missouri, first deployed during WWII was also deployed in the Gulf War.
The knee joint is made up by the femur, the tibia and the kneecap.
Many freshwater fishes are also popular as food.
This animation demonstrates how a CRT television works.
As opposed to opencast mines, in underground mines the layers covering coal are not removed, coal is extracted from mine shafts.
Freshwater fish used as food in many parts of the world.
A fuel cell provides environment-friendly electric energy produced by the chemical reaction between oxygen and hydrogen.
A ray of light is reflected or refracted at the boundary of two mediums with different refractive indices.
The reflex triggered by the stretching of the thigh extensor muscle is the patellar reflex.
This animation demonstrates the anatomy of birds through the example of mallards.