By Dr. Brian McDonough, Medical Editor

PHILADELPHIA (CBS) – A new report in the dermatology edition of The Journal of the American Medical Association suggests that Americans should buy umbrellas – but not for the rain!

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Umbrellas can fight skin cancer by blocking UV rays.

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A study from Emory University measured the ultraviolet radiation under 22 different rain umbrellas and found that they block an average of 77% of UV rays.

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The hope is that Americans might consider them an extra layer of protection.