According to Wikipedia, city planning is a technical and political process concerned with the control of the use of land and design of the urban environment, including transportation networks, to […]
The helicopter was invented by the Chinese in the 4th century, more than a 1,000 years before Leonardo da Vinci. It was called the Bamboo Dragonfly and could fly 25 feet (7.6 m) up and down. The first modern helicopter was invented by the French.