Featured series 
Tag: UV Radiation
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Nation & World
Midwest summer storms threaten ozone, study warns
Summer storms in the central U.S. create the same chemical reactions damaging ozone in the Arctic, warns a Harvard study calling for a closer look at the region’s UV radiation risk.
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Nation & World
Safer tanning?
Harvard researchers have found a molecular switch that may someday make it possible to get a tan without exposure to harmful UV rays.
