Do you know people who seem so productive that you ever wonder if they ever get to sleep at all? These people go to school on time and never miss […]
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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.