"Jellyfish as a group holds some astonishing records. The world's most venomous animal is a jellyfish, the Australian Deadly Box jelly-fish (', page 50). The largest invertebrate discovered in the twentieth century is a jellyfish, the so-called Black Sea Nettle (', page 114)—thought it is practically a toy compared to the lion's mane jellies of the North Atlanta (' spp., page 52), which can reach three meters (ten feet) across the body and drag tentacles nearly 30 meters (100 feet) long. One jellyfish helped scientists win the Nobel Prize (page 198). Another grows ten percent of its body length per hour (page 208). And the world's first known case of true biological immortality was discovered in the diminutive and aptly named Immortal Jellyfish (', page 74)."