Nov 302015
 
Small solar collectors are simple devices that focus the sun’s heat into a concentrated area, often generating enough heat for cooking. Today use of solar cookers is proliferating in undeveloped parts of the world because they provide a safe and clean alternative to fuel sources such as wood and kerosene. Solar cookers, however, are far from a recent invention. The earliest solar cookers were developed in the 1700s, when the use of clear glass for covering window openings proliferated...

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