>>10015171 (pb)
"theory"
Not a theory, actual proven and easy to find science that sunlight can kill viruses and microbes.
https://sites.uci.edu/morningsignout/2018/04/26/combating-influenza-with-far-uvc-light/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2789813/
https://www.eurekalert.org/pub_releases/2018-02/cumc-sul020818.php
https://www.nature.com/articles/s41598-018-21058-w