Three Cassiopea, or upside-down jellyfish, from Bonaire, Dutch Caribbean seen from above in the lab at the Department of Invertebrate Zoology in the Smithsonian’s National Museum of Natural History.

Unlucky divers and swimmers have experienced “stinging water,” a mysterious occurrence when people are stung when they get near, but don’t touch, Cassiopeia, a type of jellyfish that spends its time ...

Swimmers in warm coastal regions often exhibit sting-like symptoms despite not coming into direct contact with venomous animals such as jellyfish. Scientists have now pinpointed the cause of these ...

A team led by scientists at the Smithsonian's National Museum of Natural History, the University of Kansas and the U.S. Naval Research Laboratory report in the Feb. 13, 2020 issue of the journal ...