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Guidelines on how to make this at home are also available online
Researchers from Nottingham University suggest that underground facilities, that are not currently used, could be transformed into farms for growing crops.
The "smudge" cities are not only an ugly result of air pollution in urban centers, painting in gray buildings and other surfaces.
It could be used as the self-cleaning surface of solar panels, preventing sand and dust from sticking to it
Scientists from the University of California, Davis, have developed new solar panels that can generate power during the night.
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