Polly's got a pen pal ... in Canada!Polly's sure that she and her new friend, Ally, will have a lot incommon. When Ally writes that she's 125 centimeters tall and weighs 25 kilograms, Polly wants to know if she's the same. Polly wishes she could go and visit her -- but Ally lives 450 kilometers away!Young readers will learn about metric units like centimeters, kilograms, kilometers, and liters as they follow this story of two friends who can't be kept apart. Copyright (C) Muze Inc. 2005. For personal use only. All rights reserved.