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https://eco123.info/wp-content/uploads/DSC_0107.jpg66043948-year-old “solar chef” Celestino Ruivo is a lecturer at the Higher Institute of Engineering of the University of Algarve, and he started using solar ovens in July 2006. His interest in solar ovens developed after he attended an international conference on solar cooking in Granada. Celestino Ruivo says that he “brought back a solar oven …