Next time you are sitting in a lecture hall, take a quick look around. You are sitting in a room alongside dozens of students. You are all studying the same […]
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.