William Kamkwamba, the 14-year-old son of a subsistence farmer in the Kansugu district of Malawi, quit school in 2001. A drought meant his parents were unable to pay school fees.
But just because he had to quit school didn't mean he was going to quit learning. He started studying the books at the village library. An old junior high textbook about electricity inspired him to build a couple of tiny wind turbines from mostly salvaged parts and bicycle wheels that powered a few lights and pumped groundwater that irrigated a few acres of precious vegetables for his family and neighboring smallholder farms.
Some villagers thought he was crazy to collect junk and spare parts. But their attitudes changed when the windmill-generated power allowed William and others to read at night and to irrigate vegetable plots. His family no longer relied on smoky kerosene lamps or batteries for the radio.
Former critics waited outside the Kamkwamba home to charge cellphones.
That small development of self-sufficiency in a dirt-poor country, where less than 5% of people had electricity or running water, led to a Kamkwamba TED Talk in 2007, followed by a New York Times bestseller, "The Boy Who Harnessed the Wind," and a heralded Netflix dramatization of the book starring Chiwetel Ejiofor, an Oscar nominee for "12 Years a Slave."
Meanwhile, Kamkwamba, now 35, graduated from high school and the Ivy League's Dartmouth College in 2017, studying engineering and environmental studies.
Kamkwamba, naturally quiet and curious, has become a more confident but still humble leader.
"Leadership is being able to listen, to incorporate others' ideas, and to lead by example,'' he told a Dartmouth publication. "It's not about imposing authority. It's about what we can achieve when we work together."