MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Making maize flour. Child using a sieve to separate different grades of maize flour. The flour is obtained by pounding grains from maize cobs using a pestle and mortar (right). The flour is then used to make various food products. Maize is a staple part of the diet in many parts of the world. Photographed in a rural area of the Gulu region of Uganda.
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