Frank William Epperson is a curious boy who wants to be an inventor when he grows up. Since inventing begins with experimenting, Frank spends a lot of time in his "laboratory" (i.e. his back porch) trying out his ideas, such as building a double-handled handcar that whizzes past the single-handled cars in his neighborhood. What Frank loves most, though, is experimenting with liquids. When he invents his own yummy flavored soda water drink, his friends...