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The Wright Flyer was the first successful powered, heavier-than-air aircraft, designed and built by the Wright brothers.
Machines converting the energy of wind into useful forms of power were already in use in the Middle Ages.
Humans have 4 types of teeth: incisors, canines, premolars and molars.
The inner planets of the Solar System are terrestrial planets while the outer planets are gas giants.
River locks make rivers with great level differences safe for boating.
The English engineer George Stephenson’s locomotive was built for a competition of locomotives in 1829.
The popular model of the American automobile factory was the first mass-produced car in the world.
As a result of the revolutionary advances in the Neolithic, settling human communities established the first lasting settlements.
The Giza Necropolis is the only one of the Ancient wonders still intact.
An average Egyptian dwelling consisted of regularly arranged rooms.
One of the directors of the circular, open-air Renaissance theatre in London was William Shakespeare.
Commercial maritime routes of container ships form a global network.
The first supersonic passenger airliner entered service in 1976.
RMS Titanic was the largest passenger ship at the beginning of the 20th century.
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.
The pancreas and the liver empty digestive juices into the duodenum.
The eye is one of our most important sense organs. When stimulated by light, electric impulses are produced by its receptors.
The Great ocean conveyor is a planet-wide system of ocean currents, which has a great influence on the Earth´s climate.
The International Space Station is a habitable satellite built with the cooperation of 16 countries.
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´s rotation.
The geographic coordinate system enables every location on the Earth to be exactly specified.