Imagine a stern-looking middle-aged woman wearing half-glasses at the end of her nose. What kind of job do you think she would have? Many people would say that she was […]
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.