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A comment on Gwern's Law: Ads cost you a tenth of your users. Parent comment

Re:Gwern's Law: Ads cost you a tenth of your users by DuskStar on Thursday March 14, 2019 @06:21PM (#19394433)
I think there's more evidence that it's lack of bright light, not an excess of screen time, that can cause nearsightedness.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5976264/

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