Designated as the first National Treasure of South Korea, the Namdaemun was one of the major gateways of Seoul's Medieval city walls.
Medieval Syrian water wheels were used to convey water to distant areas.
The eye is one of our most important sense organs. When stimulated by light, electric impulses are produced by its receptors.
The International Space Station is a habitable satellite built with the cooperation of 16 countries.
The world famous monument in England still poses mysteries for archeologist.
In transmission systems, the engine torque is modified by reducing or increasing rotational speed.
The Earth is a rocky planet with a solid crust and oxygen in its atmosphere.
Medieval townhouses were built from stone or brick and were several stories high.
The average house in Ancient Greece had a rectangular, geometrical floor plan and two stories.
Wealthy citizens in ancient Rome owned large houses with varied layouts of several rooms.
Viruses consist of protein and DNA or RNA, they reprogram infected cells to produce more viruses.
This animation demonstrates the parts of the head, the torso and the limbs.
Christopher Columbus' three-masted carrack, the Santa Maria was the flagship of his first, landmark voyage.
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 Troll A is an offshore natural gas platform, the largest offshore platform ever built: it rises about 170 meters (558 feet) above water level, weighs...
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.
The geographic coordinate system enables every location on the Earth to be exactly specified.
The difference between the temperature of the polar and equatorial zones causes atmospheric circulation which is affected by a number of factors, including...
The Earth is composed of several spherical layers.