Researchers at the University of Cambridge have developed an iridescent, plant-based film that can cool buildings and structures without the need for air conditioning. The film, inspired by the nanostructures of a beetle's exoskeleton, reflects different wavelengths of light to create shimmering colors. When applied to the outside of a house, the film can keep it 7.2°F cooler during the day and 20°F cooler during the night. The thin nanostructure film, which generates 120 watts of cooling power, is made from cellulose, a common and abundant polymer found in nature.

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