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Blue light-emitting devices and sleep cycles Blue light and violet light in the visible spectrum Retina experiencing advanced macular degeneration (AMD) Carotenoid lutein in spinach as a counter to blue light exposure
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Aerial view of Tokyo, Japan at dusk circa 2009. Tokyo Tower (right) located in Shiba Park, Minato, Tokyo, Japan. Office buildings, architecture, skyscrapers, skyline.
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Light refraction image with a cube. Prism
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Above the clouds 130 nautical miles below, astronaut Mark C. Lee floats freely without tethers as he tests the new Simplified Aid for Extravehicular Activity (EVA) Spacewalk Rescue (SAFER) system, Sept. 16, 1994. Space Shuttle Discovery, STS-64
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Plato (left) and Aristotle, detail from School of Athens, fresco by Raphael, 1508-11; in the Stanza della Segnatura, the Vatican. Plato points to the heavens and the realm of Forms, Aristotle to the earth and the realm of things.
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An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.
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Saint Lucia Day. Young girl wears Lucia crown (tinsel halo) with candles. Holds Saint Lucia Day currant laced saffron buns (lussekatter or Lucia's cats). Observed December 13 honor virgin martyr Santa Lucia (St. Lucy). Luciadagen, Christmas, Sweden
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Diverse elementary school children wearing school uniforms running outside of school. Boys girls
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Baseball laying in the grass. Homepage blog 2010, arts and entertainment, history and society, sports and games athletics
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Photos

Blue light-emitting devices and sleep cycles
Blue light and violet light in the visible spectrum
Retina experiencing advanced macular degeneration (AMD)
Carotenoid lutein in spinach as a counter to blue light exposure
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