Have you ever heard the expression "a ball of energy"?People often use the termto 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 portablegenerator in the form of a soccer ball."Julia Silverman and Jessica Matthewsdeveloped the sOccket as part of a group projectfor 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 lettingthat energy dissipate into the environment or just be lost,we're harnessing it inside using these mechanisms,this technology that essentially triesto capture everything with the movement.Everything that is harnessedis then stored in a battery of sorts."The sOccket collects and stores this energywith every kick, hit or throw of the ball.JULIA SILVERMAN: "Then the user can plugany accessory directly into the ball,like a lamp to study, or a cell phone charger.We're developing a water purifierand hopefully some other things that might be beneficial."For every fifteen minutes of game play,the sOccket can provide enough electricityto power an LED lamp for up to three hours.The ball can store up to twenty-four hours' worth of power.The International Energy Association reported last yearthat nearly one and a half billion peopledid not have access to electricity.Most of them live in sub-Saharan Africaand in India and other countries in Asia.Julia Silverman and Jessica Matthews both had experiencein developing countries before they began the project.They knew that power shortagesare a serious problem in many areas.JULIA SILVERMAN: "There's an energy crisis in the world.One out of every five people in the global populationdon't have any electricity whatsoever.And beyond that, there are a lot of health issuesbecause what people use instead of the electricityare harmful alternatives like kerosene lamps,which produce a lot of smoke."Ms. Silverman says the sOccketis one small solution to a big problem.JULIA SILVERMAN: "And so we knew that just a little bit of lightwould make a huge difference.And we also knew that soccer was the most popular sport,most loved sport in the whole world."Jessica Matthews and Julia Silverman have starteda nonprofit organization called Uncharted Play.They hope their sOccket ball will shine more lighton the problem of power shortages.It offers people a chance to put their energyinto the world's most popular sport and get some energy in return.And that's the VOA Special English Technology Report.Go to 51voa.com for transcripts,MP3s and now PDF files of our stories.And follow us on Facebook, Twitter, YouTubeand iTunes at VOA Learning English.