http://news.bbc.co.uk/2/hi/africa/8257153.stm
Malawi teenager built windmills out of junk to bring electricity and water to his village. He never saw a windmill but learned about them from library books.
"Mr Kamkwamba, who is now 22 years old, knocked together a turbine from spare bicycle parts, a tractor fan blade and an old shock absorber, and fashioned blades from plastic pipes, flattened by being held over a fire."
"Meanwhile, he installed a solar-powered mechanical pump, donated by well-wishers, above a borehole, adding water storage tanks and bringing the first potable water source to the entire region around his village. He upgraded his original windmill to 48-volts and anchored it in concrete after its wooden base was chewed away by termites. Then he built a new windmill, dubbed the Green Machine, which turned a water pump to irrigate his family's field. "
"He is now on a scholarship at the elite African Leadership Academy in Johannesburg, South Africa.
Mr Kamkwamba - who has been flown to conferences around the globe to recount his life-story - has the world at his feet, but is determined to return home after his studies.
The home-grown hero aims to finish bringing power, not just to the rest of his village, but to all Malawians, only 2% of whom have electricity.
"I want to help my country and apply the knowledge I've learned," he says. "I feel there's lots of work to be done."