3 ms·
Why on earth not?
by scaryclam 9y ago
Why on earth not?
- dcminter 9y agoBecause 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! :)
- CalRobert 9y agoPerhaps because normal glass blocks the UVB which stimulates vitamin D production? Similarly, you don't get sunburned indoors. http://www.skincancer.org/healthy-lifestyle/vitamin-d/make-vitamin-d-not-uv-a-priority http://www.skincancer.org/healthy-lifestyle/vitamin-d/make-v...