Jellyfish
"They dodge death by hitting rewind. Even after a dead medusa has collapsed into a pile of mush, its cells can grow into polyps…"
Immortal jellyfish, and a few similar species, are said to be immortal. But how true is this claim? Dr Helen Scales explains.

Jellyfish guide: how they reproduce, do they have brains and why one species is biologically immortal
Lisa-Ann Gershwin reveals fascinating facts about these ancient, marine coelenterates.
