By the time she's two years old, Violet Van Winkle can fix nearly any appliance in the house. And by eight she's building an elaborate flying machines from scratch, mind-boggling contraptions such as the Tubbubbler, the Bicycopter, and the Wing-a-ma-jig. The kids at school tease her, but they have no idea what she's capable of. Maybe she could earn their respect by winning the blue ribbon in the upcoming Air Show. Or maybe something even better will...