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This Sept. 26, 2017 satellite image made available by NASA shows Toledo, Ohio in the lower left corner with a large phytoplankton bloom in western Lake Erie. According to the National Oceanic and Atmospheric Administration, the bloom contains microcystis, a type of freshwater cyanobacteria. These phytoplankton produce toxins that can contaminate drinking water and pose a risk to human and animal health when there is direct contact. This natural-color image was captured by the Operational Land Imager (OLI) on the Landsat 8 satellite. (NASA via AP)

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