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Engineers have made a thin material from glass and plastic. It can cool buildings and things even under the hot sun. It does not need energy or water to work. It could replace air conditioners, which need lots of power and water. The material is not like anything in nature. It is as thin as the aluminium foil we use for cooking.
The engineers explained how the material works. First, it cools anything under it by reflecting the sun. Second, it takes away heat from the thing under it. An engineer is excited about it. He wants to see it in the power industry, aerospace, farming and more. Just a little of the material could cool a house in the summer.
Back to the air conditioning lesson.