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We're currently undergoing a mass experiment in what happens to children if they are denied sun exposure. I guess we'll discover the outcomes in a few years.


Nordic countries are regularly denied sun.


That's simply untrue: https://www.ndsc.ncep.noaa.gov/uvspect_web/Polar/

Moreover, people of Nordic ancestry tend to have paler skin, which is arguably an adaptation to the low levels of UV.




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