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Adel El Shentenawy, co-founder of Egyptian Hydrofarms, shows Ed Butler around his start-up - a farm that grows lettuce in the Egyptian desert using water-saving technology. Egypt is one of the biggest food importers in the world. Farmers like Adel hope these techniques can make the country more self-sufficient. (Photo: Adel El Shentenawy at Egyptian Hydrofarms, Credit: Â鶹Éç)