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Why Rudolph Guided Santa's Sleigh?

A Dartmouth researcher says reindeer can see UV or blue light which helps them see at night. But fog easily obscures the blue light. Red light travels through fog, and the rest is history. http://www.npr.org/2015/12/23/460784584/research-explains-why-rudolph-guided-santas-sleigh #FullNewsAudioAvailable #NPR

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