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For Better or For Worse by Lynn Johnston for January 12, 2011
January 11, 2011
January 13, 2011
Yeah, I was going to bring that up earlier, but I wasn’t sure of the exact threshold. Anything over about 30 is overkill. Conversely, If you want to tan, keep the numbers very low. SPF 15 filters out or blocks 92% of UV(B) rays from the sun.