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The catalytic converter is a special filtering device that neutralises harmful exhaust gases emitted by cars through chemical reactions before being released into the atmosphere.
The saguaro is one of the tallest and best-known cactus species in the world. It is also the official state symbol of Arizona.
The Grand Canyon is one of the Seven Natural Wonders of the World.
This scene presents the transport network and main administrative divisions of Malta.
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.
The inner planets of the Solar System are terrestrial planets while the outer planets are gas giants.
Humans have 4 types of teeth: incisors, canines, premolars and molars.
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.