Why are three goals called a hat trick? Why is "Take Me Out to the Ballgame" sung during the seventh-inning stretch? Why don't the Cleveland Browns have a logo on their helmet? Why do golf balls have dimples? Why do Olympic swimmers flip when they turn at the end of the pool? Divided into four levels of difficulty - a professional level, an All-Star level, an MVP level and a Hall of Fame level - each answer is provided not only with an in-depth explanation on the science, history or origin of the particular subject matter, but with photos and illustrations that help make the information easy to digest. A must-have book for any curious young sports fan, the dynamic content is distinctly "Sports Illustrated Kids" in the way it entertains as it informs, focusing on the fun kids derive from their enjoyment of sports and presenting big, exciting action photos from the Sports Illustrated collection. A four-part interactive quiz at the back of the book invites readers to find the biggest adult sports fans they know and attempt to stump them with the fascinating insider knowledge the book provides.