[The Christian Science Monitor] “One laptop per child” was the ambitious promise a group of MIT faculty members made to the world in January last year. The idea to develop and produce millions of simple, Internet-capable $100 laptops and give them to the poorest kids on the planet sounded appealing. But just how children in remote villages in sub-Saharan Africa were supposed to hook up to the Internet was unclear. The solution may come out of thin air. Literally. All you need is a rooftop and the sun, claim the inventors of a solar-powered wireless device.