A cheap way to see if too much blue light from Fluorescent lights, TVs, Computer screens or, if you work the night shift, daylight may be slowing your natural melatonin production is to make this mask from any brown soda bottle. I found Dad's Root Beer to be the right size in the 1 liter bottle. The...By: mrdovie
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Source: http://www.instructables.com/id/Blue-Blocker-Mask-from-a-Soda-Bottle/
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