The jellyfish are coming! Experts tangle with exploding population

NBC News
A "jellyfish bloom" may sound pretty, but it can get ugly fast. A swarm of moon jellyfish from the Baltic Sea were sucked into the cooling pipes of a nuclear power plant on the Swedish coast last week, shutting down one of the three units for four days. In 2008, another such "bloom," glowing purple, wiped out an entire farm of salmon in Northern Ireland by stinging and suffocating the 100,000-strong school to death.