Jellyfish are known for drifting to and fro at the whim of ocean currents—but not all species are so passive. The millions of golden jellyfish that pack Palau’s Jellyfish Lake spend much of ...

MedusApp (jellyfish are medusas in Spanish), a citizen science phone app set up to allow the public to record sightings and stings, has reported hundreds each day this summer. It publishes a map ...