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mkempe
on Dec 7, 2017
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The Big Vitamin D Mistake
UVB rays do pass through clouds.
WillPostForFood
on Dec 7, 2017
[–]
It is more complicated than that. A dark cloudy day (no gaps to sky) will not have much UVB. A day with thin high clouds won't block much, and may make it worse (reflecting or scattering).
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