See below for English description. Savez-vous pourquoi votre ombre change de forme au fil de la journée? Ou comment est produit le bruit assourdissant d'un sifflet? Ou encore pourquoi un ballon en caoutchouc rebondit? Vous trouverez les réponses à toutes ces questions et bien d'autres dans ce livre épatant, le premier de la nouvelle série Je comprends! This book will answer questions kids have long wanted answers to, and go on to answer questions they didn't even know they had! Do you know why your shadow changes shape throughout the day? Do you know how a whistle makes that trilling sound? How about why a rubber ball bounces? All of these questions and more are explained in this exciting book, the first of two in the Je comprends! series. With the growing focus on STEM for this early age group, Je comprends! Comment ça marche is perfectly timed to reach early readers and instill a love of STEM from day one. Original title:Now You Know How It Works