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Some are. All jellyfish sting their prey with nematocysts, but only some can hurt humans. Being touched by a jellyfish or touching one can be very uncomfortable, and may require medical attention. However most cases are that humans have no reaction. But because of the huge variation of responses to jellyfish stings, from no effect to death, it is wisest not to contact a jellyfish with bare skin, since even beached and dying jellyfish can still sting, when poked and prodded.

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16y ago

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