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Strong sunlight on a black surface like fresh asphalt or a black skillet can be hot enough to fry an egg, slowly. The sun can heat surfaces to about 150 degrees easily in Phoenix in the summertime.

The sun can be used to boil an egg with a small reflector. A curved mirror (usually polished metal) can focus sunlight on a cookpot to boil water. This method is encouraged by United Nations relief workers in areas suffering deforestation. A tree cut for firewood is useful once and takes years to grow again, but a solar cooking system is useful nearly every day for a lifetime in the tropics.

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14y ago

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