Suppose that you saw a long, thin brown rope hanging from a tree and that the rope suddenly started to move. What would you think it was? If you were […]
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.