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 love it! And this gets him to thinking: "I wonder what this drink would taste like frozen?" Though he doesn't yet realize it, his curiosity will lead to his best invention ever: the Popsicle!