Lucy is having trouble with her school project on Leonardo Da Vinci, so Angela takes her and Old Tom to the local museum to get more information. While there, Old Tom and Lucy play around on a replica of a Da Vinci flying machine, and actually make it work! They fly it around the museum to where a professor is explaining why Da Vinci's flying machines can never work. The museum curator is horrified that Old Tom and Lucy are playing in one of his exhibits, but the professor is amazed and delighted that they have made it fly. To Angela's delight, he congratulates the youngsters and helps Lucy finish her project.