Human skin color is determined by the interaction of melanin, carotene and hemoglobin. Storage of water, fat, glucose and vitamin D is also a function of the integumentary system, according to the AAD.
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The SMPTE formula looks like this: Screen Diagonal (inches) / 0.6 = Viewing Distance (inches). For a 65-inch screen, the SMPTE-recommended distance would be 108 inches, or nine feet.