The difference between the temperature of the polar and equatorial zones causes atmospheric circulation which is affected by a number of factors, including...
The International Space Station is a habitable satellite built with the cooperation of 16 countries.
The eye is one of our most important sense organs. When stimulated by light, electric impulses are produced by its receptors.
The pancreas and the liver empty digestive juices into the duodenum.
Lymph vessels carry lymph to the blood vessels, while lymph nodes are integral parts of the immune system.
Eukaryotic cells contain a number of organelles.
The ribs, the sternum and the spinal column form the skeleton of the chest.
This animation demonstrates Sir Isaac Newton's three laws of motion that laid the foundation for classical mechanics.
Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes continuously changes during the year.
The animation shows the traditional Japanese wooden townhouse, the machiya.
While generators convert mechanical energy into electrical energy, electric motors convert electrical energy into mechanical energy.
Physical properties, as well as the flora and fauna of the ocean change with depth.
This animations demonstrates the exterior and interior construction of cars, as well as their operation.
The animation demonstrates the different flower types of angiosperms.
Built in Neo-Byzantine style, this Orthodox cathedral is one of the symbols of the Bulgarian capital city.
A type of steam locomotives used by British Railways were manufactured in the 1950s.
Marie Curie, the only person to win the Nobel Prize in two different sciences, is probably the most famous woman in the history of science.
The geographic coordinate system enables every location on the Earth to be exactly specified.
The orbits of the 8 planets in our Solar System are elliptical.
This animation explains transparency and opacity, the principle of radiography, and the light-absorbing properties of materials.