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A comment on What Do You Lack? Probably Vitamin D. Parent comment

Re:What Do You Lack? Probably Vitamin D by kragen on Tuesday July 27, 2010 @10:30PM (#1553399)
SPF 10 is 90% covered, and cotton T-shirts are usually higher than that. You'll find that you can see visible light through a T-shirt at around a 10× reduction too.
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