Smart people on Twitter have informed me that the coronavirus infection peaks and valleys are because the virus is "seasonal," which surprised me because I didn't even know viruses could read calendars.
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1. Warmer air rises = better airflow? 2. UV intensity varies widely between seasons, and UV light (injection even
) kills viruses on surfaces (and in the air?)
3. Related, in a lot of areas Winter sunlight doesn't contain enough UVB radiation for our skin to to make vitamin D 
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UV Mid-Winter (July) vs Mid-Summer (January), here on the East coast of Australia


pic.twitter.com/qmlUz2950m
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