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In this November 13, 2005 file photo, a man and a woman walk their dog along the mountain Schauinsland near Freiburg, southern Germany, with fields of fog in the Rhine valley. The long-debated question of where dogs first appeared has always been complex, and now a new study suggests it may have two answers. Dogs arose from the domestication of wolves, and research released Thursday, June 2, 2016 by the journal Science suggests this happened twice, once in Asia and also in either Europe or the Near East. (Photo by Winfried Rothermel/AP Photo)
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