Is jellyfish intelligence a superpower? Marine biologists show these soft-bodied sea animals learn to navigate through mangrove roots. But a memory is not their only hidden talent.
Behold the misunderstood genius of the sea
Spineless: Sea jellies are not fish but plankton that drift on the ocean currents. Glossary
Venomous - Poisonous.
Nobel prize - One of a set of prizes, laid out in the will of Swedish chemist Alfred Nobel, given each year to people who "have conferred the greatest benefit to humankind".
Spores - Cells produced by fungi for reproduction. They are dispersed over a wide area.