A researcher is trying to solve a marine mystery in the waters off Cape Cod — why a particular jellyfish, not known for stinging people, has been stinging swimmers in recent years.

Using protective gloves, Nicole Corbett shows the mystery she is trying to get to the bottom of in the waters off Mashpee.

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"This is the one we are trying to figure out," she said as she moved the moon jellyfish onto the dock and measured it to be more than 12 inches wide.

It's not typically responsible for stinging beachgoers. "The sting cells in moon jellies are too weak to penetrate human skin," explained Corbett, who leads the Popponesset Water Stewardship Alliance.

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