Why does a football spiral? How do some athletes jump so high? And why does Newton's Law of Motion matter? This illustrated guide for readers 8 to 12 offers accessible explanations from the disciplines of chemistry, biology, physics, and technology. Whether you want to learn to calculate a batting average, better understand why we wear helmets and cleats, or just find out which sport you are best suited for, the information provided here supplies the serious numbers that go into that perfect dive, three-pointer, or drop shot.