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The Earth's only immortal species is a tiny transparent jellyfish that travels the world in the ballast tanks of cargo ships. It's the only known animal capable of reverting completely to a sexually immature stage after having reached maturity, as Dr Karl Kruszelnicki explains. Down through the ages, there have always been myths about immortality, that godlike ability to live forever. Well, sometimes myths can have a nugget of truth. Indeed, it was our scientists—more specifically, the marine biologists—who found a creature that comes closest to immortality: a tiny transparent jellyfish.