An acclaimed author and a #1 New York Times bestselling illustrator team up to bring us a funny, warm, and utterly winning chapter book that follows, day by day, the first hundred days in one first grader's classroom. In just one hundred days, Harry will learn how to overcome first-day jitters, what a "family circle" is, why guinea pigs aren't scary after all, what a silent "e" is about, how to count to 100 in tons of different...