In many of the world's poorest countries, a lot of the food that’s harvested is lost due to pests and poor storage conditions. At the University of Kassel, German and African researchers are searching for ways to improve storage facilities.
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They're turning traditional mud houses into cool houses to store yams, using fans that run on solar power. And they've developed a little microphone that allows people to hear whether cockroaches or rice weevils are present in grain silos.