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For us, today, it is entirely natural to get on a plane and travel great distances; but this is a possibility we have only recently achieved! In the past, man has always cultivated the dream of flying, and even the great Leonardo da Vinci, a genius of the Renaissance, tried to realize this aspiration. By observing the flight of birds, Leonardo studied the movements of wings and designed extraordinary flying machines incredibly similar to hang gliders, helicopters, and even modern airplanes! Build the models of the ornithopter and the aerial screw, then read the book and discover all the secrets of flight!
