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 number three 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)
