Environment

Sweden Nuclear Jellyfish.JPEG-02846.jpg

** FILE ** In this Friday, Dec. 17, 2010, file photo, moon jellyfish are pictured in an aquarium of the Oceanographic Museum of Monaco. It wasn't a tsunami, but it had the same effect: A wave of jellyfish was huge enough to force one of the world's largest nuclear reactors to shut down — a phenomenon that marine biologists say could become more common. Operators of the Oskarshamn nuclear plant in southeastern Sweden had to scramble reactor No. 3 on Sunday, Sept. 29, 2013, after tons of jellyfish clogged the pipes that bring in cool water to the plant's turbines. (AP Photo/Lionel Cironneau, File)