This is the VOA Special English Technology Report.

Have you ever heard the expression "a ball of energy"? People often use the term to describe very active children. But today we tell about an invention called the sOccket, that is a real ball of energy. Julia Silverman explains.

JULIA SILVERMAN: "The sOccket is a cutting-edge portable generator in the form of a soccer ball."

Julia Silverman and Jessica Matthews developed the sOccket as part of a group project for an engineering class at Harvard University.

To better understand what a sOccket is, you first need to understand how it works.

JULIA SILVERMAN: "When you play with the ball, there is all this energy being transferred to the ball -- even any normal soccer ball.

Basically, what we're trying to do is instead of letting that energy dissipate into the environment or just be lost, we're harnessing it inside using these mechanisms, this technology that essentially tries to capture everything with the movement. Everything that is harnessed is then stored in a battery of sorts."The sOccket collects and stores this energy with every kick, hit or throw of the ball.