We are told that sunscreen breaks down after two hours. Does it break down at the same rate out of the sun? How many times should it be reapplied?
from Well http://well.blogs.nytimes.com/2014/07/03/ask-well-reapply-your-sunscreen/
from Well http://well.blogs.nytimes.com/2014/07/03/ask-well-reapply-your-sunscreen/
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