If you're a doctor doing battle with Africa's AIDS epidemic, you can't be a snob about where you get your next good idea. Ernest Darkoh got one of his best ideas from Wal-Mart.
Darkoh, 35, has always had an appreciation for the hardheaded logic of business and has always felt that there is a place for it in the gentler field of healing. The son of Ghanaian academics, he was born in Wisconsin, reared in Tanzania and Kenya, and earned degrees in medicine and public health at Harvard and an M.B.A. at Oxford. After graduating, he followed his business bent and...
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