"Getting cool, then, means protecting yourself not just from the sun’s radiation but also from all the radiation bouncing off the pavement and concrete. A new textile—made of plastic and silver nanowires—does just that, and can keep its wearers as much as 16 degrees cooler than other fabrics." https://www.fastcompany.com/91142992/this-impossibly-thin-fabric-could-cool-you-down-by-16-degrees
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Now that's an important invention, as we deal with climate change.
Hopefully it can be made widely available.