And because the top-spinning ball spins in the same direction as the ball travels, the ball continues quickly even after bouncing. So, the ball travels quickly both before and after its collision ...

One American racquet manufacturing exec estimates that polyester string accounts for more than 70 percent of string sold in Europe, and the majority of the world’s top juniors are polyester or ...

In many ball sports like golf, football and tennis, controlling the ball’s spin is an important skill. Expert players can make golf balls curve around obstacles, launch footballs towards goal ...