Sun and Skin
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Watch this video about the sun and our skin on HowStuffWorks. Researchers have found that Vitamin D created in the skin can trigger an immune response in the skin itself. Learn how human skin works... (more info)

Watch this video about the sun and our skin on HowStuffWorks. Researchers have found that Vitamin D created in the skin can trigger an immune response in the skin itself. Learn how human skin works in this video from ScienCentral.

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