IRMA INCOMING Hurricane Irma passed by Cuba on September 8, 2017, as a Category 4 storm (seen in this geocolor image captured by NOAA’s GOES-16 satellite) before making landfall in the Florida Keys on September 10, 2017.
BAD AIR U.S. pollution levels have come way down since the 1970s, but there’s still enough smog to raise the risk for cardiovascular deaths. Researchers are also drawing new connections between dirty air and metabolic and brain disorders.
SNOW DECORATION Algae turn the snow pink and red on parts of Alaska’s Harding Icefield. New research finds that the pink snow melts faster than clean snow.