The National Academies of Science, Engineering and Medicine recommends that most adults get about 600 international units of vitamin D per day through food or supplements, increasing that dose to 800 IUs per day for those 70 or older. essgee51/Flickr hide caption

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essgee51/Flickr

A Bit More Vitamin D Might Help Prevent Colds And Flu

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A bicycle messenger struggles through the snow in downtown Cleveland on Friday. Mark Duncan/AP hide caption

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Mark Duncan/AP

Yes, The Weather Is Polar. No, It's Not The Vortex

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Scenes from the Apostle Islands National Lakeshore in Bayfield, Wis., where Lake Superior's ice is thick enough to walk to the area's sea caves for the first time in five years. Derek Montgomery for MPR News hide caption

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Derek Montgomery for MPR News

'Almost Otherworldly': The Sea Caves Of Lake Superior, On Ice

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National Weather Service radar image, from 7:41 a.m. ET on Dec. 29, of storms moving over Los Angeles. wrh.noaa.gov hide caption

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wrh.noaa.gov

Ina Jaffe on the snow pack in the Sierras

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