Every day, you use your brain in many different ways. You use it to learn new material at school, to talk with your friends, and even to blink your eyes. […]
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.