Sunlight, Natural Light, Vitamin D  

Avoid the Blue Light and Indoor Light 

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Sunshine - does a body GOOD!  Natural outside sunshine

Helps with depression and many health related issues. May actually PREVENT cancer.  

http://www.lifehack.org/articles/lifestyle/10-surprising-health-benefits-sunshine-that-make-you-love-the-sun-more.html

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Sunshine Benefits

Naturally boosts immune system and fights bacteria and infections.