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Because the ultraviolet-B component of sunlight is what allows your skin to create vitamin D, and glass blocks ultraviolet-B pretty effectively.
by dcminter 9y ago
Because the ultraviolet-B component of sunlight is what allows your skin to create vitamin D, and glass blocks ultraviolet-B pretty effectively.
- scaryclam 9y agoWow, thanks for the information, I didn't know that! :)