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Certain cells within Crittenden's retinas that contain melanopsin help his brain to detect light, even if what he sees is darkness. Among other things, these light-detecting cells help his body regulate his sleep cycles. Marta Iwanek for NPR hide caption

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Marta Iwanek for NPR

Perceiving without seeing: How light resets your internal clock

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"Right now, there is no data on whether the UVA rays of the sun can inactivate this coronavirus," says Juan Leon, a virologist who focuses on environmental health at Emory University. ICHIRO/Getty Images hide caption

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ICHIRO/Getty Images

The National Academies of Science, Engineering and Medicine recommends that most adults get about 600 international units of vitamin D per day through food or supplements, increasing that dose to 800 IUs per day for those 70 or older. essgee51/Flickr hide caption

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essgee51/Flickr

A Bit More Vitamin D Might Help Prevent Colds And Flu

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