Немате ставки во вашата кошничка.
Today we think nothing of boarding a plane and travelling great distances, but for many years man dreamed of learning to fly. Renaissance genius Leonardo da Vinci was one of the first to study flight and design flying machines. He observed birds and then based his flying machines on their movements. Today’s hang gliders, helicopters and other modern aircraft are quite similar to his inventions.
Construct the models of the ornithopter and the aerial screw, and then read the book to discover all the secrets of flight!