Most living creatures are bound by the fact of birth, aging and death. Few, however, have evolved to break the typical life cycle. The aptly named immortal jellyfish (Turritopsis dohrnii) is one such ...

Box jellyfish do not have brains — yet, a new study shows they are still capable of learning. Researchers over time managed to train box jellyfish to avoid obstacles in a low-light environment. That ...

They don’t have a brain or spinal cord. They float around in a way that often appears aimless. Though jellyfish lack a central nervous system, these gelatinous creatures again show that they might ...