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How to make a large mould for shaping many cardboard solar cookers

Make a large mould from cob or concrete or plaster and use it to form many cardboard solar cookers. A sq meter of kitchen foil backed cardboard can diliver 400 watts or more of reflected sunlight for solar cooking! Use this as a DIY project and help others learn from your experience. Solar cookers save lives in refugee camps. Make it easier for them to make solar cookers and help save more lives. Thank you
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