William Kamkwamba built a windmill using scraps at the age of 14 to power his home in Malawi. You can listen to his TED talk here.
Since TED, William has been busy travelling around the world sharing his story. He will be releasing a book about his windmill adventrue (with Bryan Mealer) called The boy who harnessed the wind: creating currents of electricity and hope in September later this year. You can pre-order the book here.