Giant jellyfish with tentacles stretching up to 120 feet long are swarming U.S. beaches, prompting officials to warn that they can still sting for up to 25 days after dying. The creatures have been spotted from Massachusetts’ North Shore to Cape Cod and Nantucket, with some drifting as far north as Maine. Their tentacles contain potent neurotoxins that can cause a sharp, burning sensation when they come into contact with skin. The pain can intensify over the course of an hour and may be accompanied by red welts, itching, muscle cramps, headaches, or nausea. #usa #beach #jellyfish