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.

如今二十二岁的他第二次站在TED的讲台上，向我们讲述发明改变生活的感人故事。

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"All of us, even my mother, thought that he had gone mad, " said his sister Doris Kamkwamba.

CNN: Malawian boy uses wind to power hope, electrify village

Kamkwamba, now 22, is a student at the African Leadership Academy, an elite South African school for young leaders.

CNN: Malawian boy uses wind to power hope, electrify village

Mealer, a native of San Antonio, Texas, said he lived with Kamkwamba in his village for months to write the book.

CNN: Malawian boy uses wind to power hope, electrify village