Cheap illumination's benefits in remote areas may be limited

But will it help him learn? FOR sunny places not connected to the electricity grid, the falling price of solar panels and LED lighting promises a bright future. No more smoky, lung-damaging kerosene lamps. Greater security and safety. More ways to connect with the world--even if that involves only something as simple as being able to charge a mobile phone. And, above all, the chance to work or study into the evening and thus improve both a family's immediate economic circumstances and its childr...