It's such a smart idea to invent a cheap solar-powered cardboard-made cooking box! This Kyoto box was made with 2 card boxes and an acrylic cover - with Jon Bohmer as its inventor. He designed this product for areas and locations which are less fortunate to have safe and clean cooking facilities. Also the cardboard cooking box is said to help a family to prevent 2 tonnes of carbon emission per year.
As for the design, the Kyoto box consists a layer of newspaper or straw in between the boxes acts as insulation, with foil on the outside and black paint on the inside of the boxes absorb and capture solar heat. And the cost is only about $5, and can be produced at almost any cardboard factories!
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