Take away recess? Not if Addie can help it! When Mrs. Wilson makes the class sort pens and pencils instead of heading out for recess, Addie Greer has had enough. She takes it upon herself to make sure this awful, unfair situation never happens again. Addie enlists the help of her two best friends, Grace and Daniel, to design and build the perfect device for sorting pens, pencils, and crayons. They each come up...