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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.
You need the ° or else you're just making errybody mad. Or maybe that's just me.
Maybe it's a mental reading thing. I always "hear" the word "degrees" in my head when I see °, so I like the extra effort to include that, but I also know that colloquially, people are a lot lazier.