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This animation demonstrates how sonar works.
The bicycling manual contains rules concerning the safety equipment of bicycles.
The Benz Patent-Motorwagen is widely regarded as the first vehicle propelled by an...
Heavy trucks play an important role in transportation.
One of the most modern means of transportation is the Maglev, capable of traveling at...
The German triplane was perhaps the best known plane in World War I.
Oil tankers appeared in the late 19th century; today they are among the largest ships.
This animation demonstrates how elevators work.