Four Harsh Truths That Will Make You a Healthier Person

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http://vitals.lifehacker.com/four-harsh-truths-that-will-make-you-a-healthier-person-1684899154

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Why we need to sleep in total darkness (article)

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http://io9.com/why-we-need-to-sleep-in-total-darkness-1497075228/@whitsongordon