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A panel cooker is a type of solar oven that is known for being the least expensive option. It uses panels, often made from corrugated cardboard and covered with reflective material like aluminum foil or Mylar, to concentrate the sun's rays onto a black cooking pot. This pot is typically placed inside an insulating plastic bag to trap the heat and cook the food. Solar ovens, in general, harness sunlight for cooking and are advantageous because they do not require fuel, thus preventing deforestation and desertification. They are also useful for camping or when electricity is unavailable.1

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2 Britannica Sources
  1. cookstove
  2. solar oven

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