Some jellyfish can age backwards.

Wacky WorldOceans

Turritopsis dohrnii, the “immortal jellyfish”, can revert to an earlier life stage when stressed, potentially repeating its life cycle.

Another wacky fact → All facts

Explore more Wacky World facts

The deepest point reached by a diver on one breath is over 200 m.An ocean “conveyor belt” takes about 1,000 years to circle the globe.Sea otters hold paws while sleeping to avoid drifting apart.