Strange Inventions
Even though many of the inventions introduced in the past one hundred years have contribut...
An airship is an aircraft that uses a gas that is lighter than air to lift off the ground. The gas is held in a large elongated bag. Unlike hot-air balloons, airships can be easily steered. If the gas bag is flexible, like a balloon, the airship is called a blimp. If the gas bag is rigid, the airship is called a dirigible or zeppelin. Originally, airships used hydrogen as the lifting gas. Hydrogen is flammable. Newer airships use helium. Airships were used to transport passengers. They were also used by the military for bombing and scouting missions. The first commercial airline used airships before World War I. In the 1930s, airships flew regularly between Germany and North and South America. Since the 1930s, airships have not been widely used to carry passengers. The airplane is faster, more maneuverable, and less susceptible to high winds. Today airships are used as advertising, and to get a "bird's eye view" of sporting events.
Even though many of the inventions introduced in the past one hundred years have contribut...
Just like any other skill, reading ability improves with practice, and few skills can prov...
Most people know the name of the first man on the moon. His name is Neil Armstrong. Howeve...