* Dorothy Canfield Fisher Children's Book Award *
In this award-winning story, two classmates set out to create affordable toothpaste and become accidental millionaires Sixth-grader Rufus Mayflower is betting that he can make a whole gallon of toothpaste for the same price as one tube from the store. There's just one problem, he has to solve real-life mathematical equations first With help from his good friend Kate Mackinstrey, can...