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Scientists in Uganda are at the forefront of developing a technique called biofortification to increase the yield and spread of the orange-fleshed sweet potato. The variety is known to prevent against vitamin A deficiency, which drastically increases the susceptibility to fatal illnesses and is the leading cause of preventable childhood blindness in Africa. The Â鶹Éç's Nancy Kacungira reports on its many benefits. (Photo: The orange-fleshed sweet potato. Credit: Â鶹Éç)