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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.
Short bursts, finding shade, and lots of water and wind (box fans, as the other fella mentioned). A good hat helps immensely. If you can duck inside someone's AC, you take the fresh air like it's the last soup you'll ever have and you suck it in.