In baseball there is a rare but beautiful pitch known as the knuckleball. It is difficult to learn and takes a lifetime to perfect. It glides through the air without spin and zigzags from side to side before reaching the plate. Even the best knuckleball pitchers struggle to throw it effectively. Most catchers simply can’t react fast enough to the ball’s late movements to keep it in their mitts. Hall of Fame hitters look silly as they swing two feet away from a ball traveling slowly around their bats. When a knuckleball pitcher is on his game, batters never look...