DS> not only do skin damage but also penetrate the skins layers and can 
ffect
DS> cells of the blood causing blood disorders and perhaps leukemia. 
unscreen
DS> doesn't stop the sun from affecting the blood. 
That's not good news at all.  What about people who work outdoors, who 
can't avoid the sun?  If sunscreens are not enough, what can they do 
about this?
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