Sports get the blood pumping and hearts racing. Fans scream and cheer as their favourite athletes run, throw, pedal, dive, or swing their way to victory. But what makes an athlete successful? Why do some players excel when others fall behind? In "Why a Curveball Curves", the experts at Popular Mechanics, along with top athletes, coaches and sports journalists, explore the science behind sports. Fluid dynamics, biomechanics and technology determine everything from speed in cycling and protection in football to performance measurement in all sports. This book is designed for both the player and the fan, helping athletes become better-prepared and giving enthusiasts a more complete understanding and appreciation of the subtle nuances of competition. The explanations are clear, entertaining and written by people who really love and understand their game.