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K2 Pedia! | Researchers Say The World Is Full Of Darkness, Reflected In The Physiology Of The Human Retina | World, Full, Retina, Likelihood, Neural, Pathways, Demonstrating, Natural, Dark, Contrasts, Humans, Use, Capture, Around, Article, Best, Adapted, Seeing, Light, Read http://www.k2pedia.com/eye-health/94737-researchers-say-the-world-is-full-of-darkness-reflected-in-the-physiology-of-the-human-retina