There has been a breakthrough in the research on box jellyfish. They have thousands of stinging cells on their ten-foot long tentacles. New discoveries have been made into their evolution. This will help in finding antivenom and new treatment for stings to humans. Some species of jelly fish have good sight: they have 24 eyes, can sense light and form images of their surroundings. Little is known, however, about what they actually see. They don't need to see to mate. Females and males just get together and fertilize eggs in a mass spawning, though some species do appear to mate one-on-one. The most dangerous jelly fish, in Australia, is the Box Jellyfish (sea wasp or stinger). Some can immobilize while others can kill. The Portuguese man of war is held to be very dangerous, but despite its name it cannot kill humans. Chironex flecken , an Australian box jellyfish, can be lethal. A similar type, Chironex yamaguchii , has killed people in Japan. Evolution of jellyfish has been p...