When you step foot in the surf, you run the risk of the sting of sea nettles, sea wasps or other jellyfish.

In fact, alarms are going off that jellyfish swarms are taking over the world's oceans - starving out food fish, injuring swimmers, overloading the nets and capsizing fishing boats and clogging the pipes to power plants and nuclear vessels. Swarms that sometimes cover hundreds of square miles recently have been reported in many of the world's prime vacation and fishing destinations, according to the National Science Foundation.

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