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Salmon swim upstream in a river outside Yuzhno-Kurilsk, the main settlement on the Southern Kurile Island of Kunashir in this September 15, 2015, file photo. Researchers on November 5, 2015, said some fish and amphibians, when navigating murky freshwater environments like rivers and streams, can turn on an enzyme in their eyes that supercharges their ability to see infrared light, sharpening their vision in the muck and mire. (Photo by Thomas Peter/Reuters)
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