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This photo is from Photo of the Day: Best of October 2009
Ultraviolet Bath, Russia
Photograph by Joe McNally
Make-believe summer lasts for a minute or two as kindergarten children in sunless Lovozero bathe in ultraviolet light. Brief exposure to UC radiation provides the children with vitamin D, normally supplied by sunlight. The "sunshine vitamin" strengthens young bones.
From the book National Geographic Image Collection, 2009