Lorsque les enfants sont jeunes, ils rêvent souvent de devenir une danseuse de ballet, de recherche et de sauvetage de pilote, ou d’explorateur. Plus tard, cependant, la plupart d’entre eux […]
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.