Betsy has an assignment to make her own musical instrument, but everything she thinks of is already taken by another member of the class. With her father's help, she discovers an instrument and the whole class plays a nice medley together. The class goes on a field trip to the Dinosaur Museum. Not only do they learn about dinosaurs, but also about what a paleontologist does. They have such fun exploring within the museum digging pit as well as at home, digging up things in the backyard of Betsy's house.