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Nissan develops paint that keeps cars cool in summer heat
(www.asahi.com)
This is a most excellent place for technology news and articles.
It's not so much the thermometer temp here in Louisiana. It's the 80-99% humidity. At these levels your body's main heat defense: Sweat - no longer works as it can't evaporate fast enough or at all. Then it becomes an insulator and a feedback loop of hell. Like being wrapped up in a wet electric blanket.