Jellyfish in an aquarium are wonderful to look at, but not to swim with. Ouch!
Rolf Vennenbernd / AFP - Getty Images
A jellyfish floats through its basin at the Sea Life Aquarium in Koenigswinter, western Germany on March 31, 2011.
Rolf Vennenbernd / EPA
Moon jellyfish swim in their aquarium at the Sea Life centre in Koenigswinter, Germany, March 31. Five different types of jellyfish are featured under the motto 'Jellyfish Magic' at the Sea Life center.