William Kamkwamba: How I harnessed the wind | Video on TED.com

To power his family's home, young William Kamkwamba built an electricity-producing windmill from spare parts and scrap -- starting him on a surprising journey detailed in the new book, "The Boy Who Harnessed the Wind."

Description:At age 14, in poverty and famine, a Malawian boy built a windmill to power his family's home. Now at 22, William Kamkwamba, who speaks at TED, here, for the second time, shares in his own words the moving tale of invention that changed his life.