People are loud. iPods are loud. Cafes are loud. Subways are loud. Our ears just aren’t designed for all that noise! Since no one wants to be middle-aged and shouting […]
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.