Sometimes a small change can make a big difference. Across sub-Saharan Africa, a new kind of sweet potato is helping families guard against vitamin A deficiency. Radio is helping to spread the word. And it doesn't stop there. The woman you see pictured here is Mwanaedi, a farmer from the village of Mwasonga in Tanzania. While she looks to be having an ordinary phone conversation, the circumstances of the call are actually quite extraordinary.
We were visiting with Mwanaedi on her porch when she took the call. We heard her explain to the caller the benefits of a particular variety of sweet potato and share tips on how to grow it, suggesting to plant the vines just before the rains in high, well-drained ridges. And she arranged to provide some vines.

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